WASHINGTON (AP) — A grand Washington ritual became a potential casualty of the partial government shutdown as House Speaker Nancy Pelosi asked President Donald Trump to postpone his Jan. 29 State of the Union speech. She cited concerns about whether the hobbled government can provide adequate security, but Republicans cast her move as a ploy to deny Trump the stage.

In a letter to Trump, Pelosi said that with both the Secret Service and the Homeland Security Department entangled in the shutdown, the president should speak to Congress another time or he should deliver the address in writing.

Homeland Security Secretary Kirstjen Nielsen denied anyone's safety is compromised, saying Wednesday that both agencies "are fully prepared to support and secure the State of the Union."

Trump did not immediately respond to the request, and the White House, thrown off guard by the move, didn't immediately offer any official response. But GOP allies accused Pelosi of playing politics, with Republican Rep. Steve Scalise tweeting that Democrats are "only interested in obstructing @realDonaldTrump, not governing."

Pelosi, who issued the customary invitation to Trump weeks ago, hit the president in a vulnerable place, as he delights in taking his message to the public and has been preparing for the address for weeks.