President Trump’s job approval during his first 100 days in office is the lowest of any commander in chief since Gallup began tracking the initial months of a president’s term in 1953. According to Gallup’s most recent weekly survey, Mr. Trump ended his 100th day where he started: with more people disapproving of his presidency than approving of it.

How Trump’s Approval Rating Compares With Previous Presidents’

Mr. Trump’s weekly average, now at 41 percent, is at a record low primarily because of high disapproval among Democrats and independents. It masks the considerable satisfaction Republicans feel with his presidency so far, but support among all three groups is lower than it was after his first week in office.

New presidents have typically enjoyed a honeymoon period with independents and members of the opposite party during their first few months. Mr. Trump has had no such holiday.

“His approval rating among people who identify with the opposite party is by far the lowest we’ve ever seen,” Frank Newport, editor in chief of Gallup, said. At the same time, Mr. Trump’s support among Republicans remains relatively high.

Taken together, these two extremes add up to the largest partisan divide over a new president since Gallup began tracking.

“That’s the result of the general trend toward polarization — and Trump, the person,” Mr. Newport said.