In the video that prompted the Twitter lockout, a protester can be heard using expletives to describe the senator and suggesting that rather than injure his shoulder, Mr. McConnell “should have broken” his neck. She also muses that someone or something should be stabbed in the heart.

After it was shut out of its account, Mr. McConnell’s campaign and some of his supporters complained vigorously that Twitter’s move had set a double standard on what kind of speech was allowed. By Thursday afternoon, officials from the Republican National Committee and the National Republican Senatorial Committee entered the fray, saying they would forgo buying new ads on Twitter until it unfroze the Team Mitch account. And by late Thursday, Mr. McConnell declared to WHAS radio in Louisville that he and his team were “in a major war” with Twitter and had not given up their fight.

Having apparently won that fight, Kevin Golden, Mr. McConnell’s campaign manager, said Friday that he and his team were pleased that Twitter had “reversed their decision.”

“It shouldn’t have taken an avalanche of outrage from across the country to stop Silicon Valley from launching an effort to silence conservatives like the majority leader of the United States Senate in the first place,” Mr. Golden said in a statement.

The other Twitter turmoil involving Mr. McConnell began over the weekend when the Team Mitch account posted a photo of a mock graveyard filled with faux tombs marked with the names of people and policies Mr. McConnell has opposed. (Mr. McConnell, who is running for re-election in 2020, has sometimes cast himself as the “grim reaper” for liberal legislation.) One of the tombstones was labeled “Amy McGrath” and dated Nov. 3, 2020, which is Election Day.

Ms. McGrath, a Democrat and retired Marine, is challenging Mr. McConnell for his Senate seat. She criticized him for posting the photo soon after the shooting in El Paso on Saturday, and said she found it “troubling that our politics have become so nasty and personal that the Senate majority leader thinks it’s appropriate to use imagery of the death of a political opponent (me) as messaging.”