Trump blasts Republican lawmaker Amash over impeachment remarks

FILE PHOTO: House Freedom Caucus member Rep. Justin Amash (R-MI) talks to reporters on Capitol Hill after attending a White House meeting on the repeal of Obamacare in Washington, U.S., March 23, 2017. REUTERS/Jonathan Ernst/File Photo

WASHINGTON (Reuters) - Donald Trump lashed out on Sunday at the first Republican congressman to call the U.S. president's behaviour impeachable, while Democrats warned Trump's stonewalling of congressional probes is strengthening the case for an impeachment inquiry.

Trump called Republican Representative Justin Amash "a total lightweight" and "a loser" on Twitter, a day after the Michigan conservative said the Mueller report showed that the Republican president "engaged in specific actions and a pattern of behaviour that meet the threshold for impeachment."