WASHINGTON (AP) — National Guard troops and Humvees guarded some Washington landmarks Thursday and advocacy organizations helped clear homeless encampments in advance of an anticipated crackdown as President Donald Trump’s takeover of city police ramped up.

The multiagency flood of federal law enforcement ordered by the Republican president to tackle crime in the nation’s capital has become increasingly high profile, with officers setting up a checkpoint Wednesday night in one of D.C.’s popular nightlife areas, drawing protests.

The White House said 45 arrests were made Wednesday night, including 29 arrests of people living in the country illegally, including for distribution or possession of drugs, carrying a concealed weapon and assaulting a federal officer.

Troops were stationed outside the Union Station transportation hub as the 800 Guard members who have been activated by Trump start in on missions that include monument security, community safety patrols and beautification efforts, the Pentagon said.

“They will remain until law and order has been restored in the District as determined by the president, standing as the gatekeepers of our great nation’s capital,” Pentagon press secretary Kingsley Wilson said. “The National Guard is uniquely qualified for this mission as a community-based force with strong local ties and disciplined training.”

Wilson said the troops won’t be armed and declined to give more details on what the safety patrols or beautification efforts would entail or how many Guard members have already been sent out on the streets.

National Guard Major Micah Maxwell said troops will assist law enforcement in a variety of roles, including traffic control posts and crowd control. The Guard members have been trained in deescalation tactics and crowd control equipment, Maxwell said.

The White House said Thursday that Guard members aren’t making arrests but are “protecting federal assets, providing a safe environment for law enforcement officers to make arrests, and deterring violent crime with a visible law enforcement presence.”

Meanwhile, about a dozen unhoused residents in Washington packed up their belongings with help from volunteers from some city agencies. Items largely were not forcibly thrown out by law enforcement, but a garbage truck idled nearby.

Several protesters held signs close by, some critical of the Trump administration. Once the residents had left, a construction vehicle from a city agency cleared through the remains of the tents.

Advocates expected law enforcement officers to fan out across D.C. later Thursday to take down any remaining homeless encampments.

For two days, small groups of federal officers have been visible in scattered parts of the city. But more were present in high-profile locations Wednesday night, and troops were expected to start doing more missions Thursday.

Agents from Homeland Security Investigations have patrolled the popular U Street corridor, while Drug Enforcement Administration officers were seen on the National Mall, with Guard members parked nearby. DEA agents also joined Metropolitan Police Department officers on patrol in the Navy Yard neighborhood, while FBI agents stood along the heavily trafficked Massachusetts Avenue.

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Associated Press journalists Jacquelyn Martin and David Klepper contributed to this report.