Republican lawmakers began a push on Sunday to draft and introduce bills seeking congressional approval for President Donald Trump’s long-planned $400 million White House ballroom, pointing to security needs in the wake of a presidential assassination attempt at the White House Correspondents’ Association dinner. The move came just two days after a gunman tried to breach security at the Washington Hilton dinner where Trump and other top officials were in attendance, prompting renewed debate over the need for a large, secure room at the White House. The president and First Lady Melania Trump were evacuated from the dinner, after the gunman breached security and shot a Secret Service agent near the security checkpoint....