When President Donald Trump stormed out of a White House meeting with congressional leaders last Wednesday, U.S. Senate Majority Leader Mitch McConnell sat there silently, uttering not a word as the talks blew up, according to others in the room.

The No. 1 Republican in Congress, who rose to power on his reputation as a master of legislative wrangling, has had little to say in public or private during a partial federal government shutdown that began on Dec. 22 and has no end in sight.

Showing no interest in defying his president and Trump's demand that triggered the shutdown for funding for a U.S.-Mexico border wall opposed by Democrats, McConnell has kept a low profile. This posture, allies and opponents said, is about McConnell protecting himself, vulnerable Republicans and their control of the Senate ahead of the 2020 elections.