In a complaint unsealed on Friday, whistle-blowers working on President Trump’s wall said that contractors were illegally bringing in Mexican guards to protect construction sites.

Federal law enforcement shifted resources last year in response to Donald Trump’s insistence that the radical left endangered the country. Meanwhile, right-wing extremism was building ominously.

If confirmed, Mr. Magnus would step into a major challenge facing the Biden administration: how to handle a record number of border crossings that are projected to increase in the coming months.

From Minneapolis to Buffalo, Homeland Security officials dispatched drones, helicopters and airplanes to monitor Black Lives Matter protests.

President Trump has reduced the flow of refugees into the country to a trickle, and even Iraqis and Afghans who risked their lives for American service members have been cut off.

The selection is part of a slate of nominations for top law enforcement posts in the country, including for three offices that tend to investigate the Justice Department’s most prominent cases.

The Defense Production Act has been invoked hundreds of thousands of times in the Trump years. But with the pandemic, the president sees it as a “break the glass” last resort.

Five new American citizens were stunned to be naturalized at a White House ceremony during the Republican National Convention. Some said they did not know they were being broadcast until friends...

An intelligence bulletin says armed militia groups and racist extremists are targeting the presidential inauguration next week.

Amid tensions with the president over his deployment of federal officers during protests, Washington’s mayor had “Black Lives Matter” painted near the White House in an unmistakable assertion of...

Chad F. Wolf, the head of the department overseeing the agency leading inauguration security, announced that he would resign as acting secretary on Monday night.

Tulsa’s top health official said the Trump rally last month may have contributed to a local surge in cases. A study in England provided more evidence of crucial risk factors for Covid-19 deaths.

Officials who lead agencies in the department and echo the president’s language on immigration were initially thought to be ineligible under a federal law.

Rather than tamping down persistent protests in Portland, Ore., a militarized presence from federal officers seems to have re-energized them.

The Capitol Police officer, who served in the Sunni triangle during one of the most dangerous periods of the Iraq War, is credited with saving the lives of members of Congress on Jan. 6.

A whistle-blower accused Kenneth T. Cuccinelli II of an abuse of power in making sweeping concessions to pro-Trump Immigration and Customs Enforcement agents.

After pledging on Twitter to end immigration during the pandemic, President Trump moved to block new green cards but stopped short of ending all work visas.

The death of Brian Sicknick, a military veteran and experienced Capitol Police officer, amplified the tragedy of Wednesday’s riots and undermined President Trump’s pro-law-enforcement claims.

In a meeting at the White House on Friday, President Trump weighed appointing Sidney Powell, who promoted conspiracy theories about rigged voting machines, to investigate voter fraud.

Mayor de Blasio’s plan drew an inflammatory response from the president, who used it to try to stoke tensions between protesters and the police.

The House oversight panel on Monday asked immigration officials to explain how migrants continue to die in homeland security’s custody.

Alejandro N. Mayorkas, a former deputy homeland security secretary, would be tasked with restoring faith in a department that carried out the Trump immigration agenda.

An initial wave of arrests was based on news accounts and social media. Proving a conspiracy could be much more challenging.

President Trump’s executive order granting local officials veto power over refugee resettlement has divided communities and left immigrants feeling unwanted.

Immigration activists and Democrats say there is a disconnect between the president’s words at the lectern and the government’s litigation in the courtroom.

An appeals court ruled that President Trump illegally diverted funding for his border wall without congressional approval, likely sending the issue to the Supreme Court.

The current leaders of the Department of Homeland Security have proved adept at following President Trump’s lead. Their latest target: guarding monuments and memorials.

Chad F. Wolf joined the Department of Homeland Security in its infancy to help prevent another 9/11. Now he is helping President Trump use it to achieve his political ambitions.

The Biden administration is shifting its strategy from mass vaccination sites to a more localized effort, deploying top officials to canvass and knock on doors.

The Department of Homeland Security can point to federal statutes protecting property to justify the arrests of protesters in Portland, Ore., but whether they stretched the law would be up to a judge.

The plan highlights a shift in the U.S. approach to counterterrorism, which for decades focused on fighting foreign terrorists.

President Biden will retreat from fruitless negotiations with lawmakers and instead emphasize his power to govern, senior White House advisers said.

The department’s inspector general delayed looking into a retaliation complaint by a former intelligence chief until after the 2020 election, according to officials and a whistle-blower.

As part of their attempt to interfere with the 2020 election, Russians are grabbing screenshots of President Trump’s tweets, or quoting his own misleading statements, analysts and officials say.

After serving as United Nations ambassador and national security adviser in the Obama administration, she has unexpectedly ended up helping oversee domestic policy in the Biden White House.

Jake Campbell was an infant when his mother, Jill Maurer-Campbell, called home from the Twin Towers, saying the North Tower had been struck.

The former president and his allies have given often conflicting defenses of his retention of classified documents, without addressing why he had kept them.

Former Republican and Democratic cabinet members and other senior officials speak out on protests, military, racial justice, policing.

The proposal, published on Friday, would prohibit families with at least one undocumented immigrant from obtaining public housing benefits.

State officials are activating National Guard troops and closing off Capitol grounds in response to F.B.I. warnings that armed protesters are preparing to act.

The Trump administration has deployed phalanxes of officers in riot gear and no identifiable markings to police demonstrations in the capital. Democrats want to know who they are.

Decisions to bus migrants to the vice president’s residence and to fly others to Martha’s Vineyard were the latest attempts to provoke outrage over record arrivals at the border.

The report, first obtained by CBS News, highlights the major threats posed by China and Russia and identifies white supremacist groups as posing the "most persistent and lethal threat" of all...