WASHINGTON (AP) — Republicans returning to Washington on Monday are facing questions about a $1 billion Senate security proposal that could help pay for President Donald Trump’s ballroom as Democrats say they will try to defeat it. Senate Republicans added the money for White House security to a spending bill that would restore funding for immigration enforcement agencies that Democrats have blocked since February. The steep security proposal was put forward after a man was charged with trying to assassinate Trump at the White House Correspondents’ Association dinner last month. Republicans are using a partisan budget maneuver to push the spending legislation through Congress without any Democratic votes. But in a letter to colleagues Monday morning, Senate Democratic leader Chuck Schumer said Democrats will fight it in other ways, including by pushing the Senate parliamentarian to strike the ballroom security money from the budget bill and offering amendments forcing Republicans to vote on it.…