President Donald Trump on Wednesday said he may use the National Guard to police the streets of Washington, D.C., and a White House official said federal law enforcement would increase its presence in the city this week.

Trump has met in-person with Zelensky at least three times since returning to office, including a Feb. 28 meeting where he lashed out at the Ukrainian president and accused him of prolonging Russia’s invasion. The two leaders met again on April 26 on the sidelines of Pope Francis’ funeral and in The Hague on June 25.