For months, Speaker Paul D. Ryan had chosen to remain largely silent, hoping that his party’s nominee for president would simply get across the finish line, dragging congressional Republicans across with him.

But a 2005 recording made public on Friday of Donald J. Trump speaking in extraordinarily vulgar terms about women became a new bridge too far across a seemingly endless landmass separating civil behavior and Mr. Trump’s campaign for the presidency.

Mr. Ryan responded by uninviting Mr. Trump from a rally in his home state, Wisconsin, on Saturday, and said he was “sickened” by Mr. Trump’s remarks. But even as many congressional Republicans, including some very conservative House members, pulled away from Mr. Trump on Saturday, Mr. Ryan did not go so far as to withdraw his support for the businessman and former reality TV star.

Mr. Ryan’s decision keeps him in the political purgatory of endorsing the Republican nominee for president while continually having to say why he finds his remarks and policy positions despicable.