WASHINGTON, March 21 - President Donald Trump argued on Tuesday that his 60 days in office have been a successful keeping of his campaign promises as he attempted to turn the page from a variety of controversies that have bedeviled his White House tenure.In a speech before the National Republican Congressional Committee, Trump sprinkled his remarks with jokes, mocked his critics and expressed optimism that a healthcare proposal he backs will a survive a close vote in the House of Representatives on Thursday. "We're doing well," Trump said of his efforts to persuade lawmakers to vote for the legislation. "I think we're going to have some great surprises. I hope that it's all going to work out."Trump's first two months have been dominated by controversies from the firing of national security adviser Michael Flynn to tweets in which he accused his predecessor, Barack Obama, of wiretapping Trump Tower, a charge that FBI Director James Comey declared without foundation on Monday.Trump's approval rating has sagged to 37 percent, according to a Gallup poll this week.