U.S. Republicans to Trump - Let Mueller do his job

FILE PHOTO: A combination of file photos showing Russian President Vladimir Putin at the Novo-Ogaryovo state residence outside Moscow, Russia, January 15, 2016 and U.S. President Donald Trump posing for a photo in New York City, U.S., May 17, 2016. REUTERS/Ivan Sekretarev/Pool/Lucas Jackson/File Photos

WASHINGTON (Reuters) - Republican senators warned President Donald Trump on Sunday not to fire Special Counsel Robert Mueller, and said the president must let federal investigators looking into Russian meddling in the U.S. election do their jobs.

The Republican president has renewed his Twitter attacks on both the Federal Bureau of Investigation and Mueller's probe since the firing on Friday of the bureau's former deputy director, Andrew McCabe, two days before he was eligible to retire with a full pension.