WASHINGTON — Sometimes, 140 characters just aren’t enough.

Seven days into a 17-day “working vacation” in Bedminster, N.J., President Trump unburdened himself during two lengthy, impromptu news conferences on Thursday, eagerly ping-ponging through the litany of domestic and foreign policy issues that have consumed his administration for weeks.

Ignoring his press secretary, who was holding a “One More Question” sign in the back of the room, Mr. Trump doubled down on his threats to North Korea, shrugged off Russia’s ejections of hundreds of American embassy staff, defended his abrupt decision on transgender troops and claimed he had never considered firing the special counsel — directly contradicting his own private statements to aides and friends.

In sometimes rambling answers filled with words like “fantastic” and “great” and “biggest” and “finest,” the president bragged about everything from the state of the economy, the size of his nuclear arsenal, the breadth of his achievements and the increase in security at the border with Mexico.

He called Lt. Gen. H. R. McMaster, his national security adviser, “my friend” and “a very talented man.” (Mr. McMaster was sitting to Mr. Trump’s right.) But the president did not foreclose the idea that Senator Mitch McConnell, Republican of Kentucky and the majority leader, should “step aside” if Republicans fail to repeal and replace the Affordable Care Act.