“The forces opposing us in Washington are the same people who squandered trillions of dollars overseas, who sacrificed our sovereignty, who shipped away our jobs, who oversaw the greatest transfer of wealth in the history of the world,” Trump said at a campaign rally in Las Vegas on Thursday. “In 2016, the American people voted to reject this corrupt globalism. Hey, I’m the president of the United States — I’m not the president of the globe.”

“I don’t want to comment on it until I get all the facts,” Mr. Trump said when asked if he would fire Mr. Rosenstein. “I haven’t gotten all the facts, but certainly it’s being looked at in terms of what took place. If anything took place and I’ll make a determination sometime later, but I don’t have the facts.”

Mr. Trump asserted that he was not worried about his former personal attorney, Michael D. Cohen, who is talking with Mr. Mueller’s prosecutors after pleading guilty to breaking campaign finance laws and other crimes.

“No, I’m not, because I’m an honest guy,” Mr. Trump said. “And that stuff is unrelated to me. And that was Michael did that stuff. And Michael I mean you know, you know I have many, many lawyers. I have very big law firms I have that do my work.”