President Donald Trump plans to sign an executive order Monday aimed at ending cashless bail for suspects arrested in Washington, D.C.,, sources familiar with the matter told ABC News.

The order is expected to threaten withholding federal funding from Washington and possibly other cities that have cashless bail, the sources said. Supporters of cashless bail have argued that it harms those lower-income offenders who don't have the means to afford paying bail for release from jail pending trial.

Trump has suggested his administration would take steps to eliminate cashless bail in Washington and other places, and has been more vocal about this in recent weeks amid his federal crackdown in the nation's capital.

"No, we're going to be essentially crime-free. This is going to be a beacon, and it's going to also serve as an example of what can be done. We have to get rid of this cashless bail nonsense," Trump said earlier this month.

Axios first reported Trump's plans to sign the order on Monday.

-ABC News' Katherine Faulders

President Donald Trump will begin his Monday by signing executive orders in the Oval Office at 10 a.m., according to the official White House schedule.

At 12:15 p.m, Trump will hold a bilateral meeting with South Korean President Lee Jae-myung, before the two men have lunch at 12:45 p.m.

ABC News' Hannah Demissie

As of Sunday night, National Guard troops operating in Washington, D.C., are now armed, according to a defense official.

This will apply to the more than 2,200 guardsmen from D.C. and other states that are now serving in the mission in D.C.

Separately, a spokesperson for Joint Task Force-DC confirmed under what rules they can be used.

“The Secretary of Defense has directed JTF-DC service members to carry their assigned service weapon. Task force personnel operate under the established Rules for the Use of Force, which allow the use of force only as a last resort and solely in response to an imminent threat of death or serious bodily harm. JTF-DC remains committed to protecting the safety and wellbeing of the residents of the District of Columbia,” a JTF-DC spokesperson said in a statement.

“Soldiers will be able to carry their service-issued weapons, which may include M-17 pistols or M-4 rifles,” the statement continued.

-ABC News’ Luis Martinez

A U.S. official confirmed to ABC News that planning is underway at the Pentagon for the potential use of National Guard forces in Chicago.

The possible call-up of National Guard members in that city was first reported by the Washington Post.

The Pentagon did not provide a comment, but a Defense official said, “We won’t speculate on further operations. The Department is a planning organization and is continuously working with other agency partners on plans to protect federal assets and personnel.”

Appearing on CNN’s “State of the Union” on Sunday, House Minority Leader Hakeem Jeffries, D-N.Y., said, “There’s no basis, no authority for Donald Trump to potentially try to drop federal troops into the city of Chicago.”

-ABC News’ Luis Martinez