The following 24 hours seem to have left Mr Trump angry but not surprised.
“It's all a hoax,” he said of the impeachment inquiry announced by House Speaker Nancy Pelosi, calling her and fellow Democrats people who work against the interests of the US.
“I have been up from early in the morning to late at night,” he said of his time in meetings at the UN this week. The media coverage was “really disappointing”.
There was nothing much of substance to be revealed about what had been achieved, not to the press at least.
“It's all about the election, that's all they're interested in,” Mr Trump said of his opponents in Washington.
Far from a breach of the US constitution, Mr Trump's July 25 call with Ukraine's President Volodymyr Zelenskiy was “beautiful ... just a wonderful conversation”.
But it has landed him in deep water. The timing, during UN week, was deliberate, the US president raged.
Reprising the language he used to condemn special counsel Robert Mueller's investigation into Russian election meddling and the conduct of Mr Trump's 2016 election campaign, impeachment is “a phoney witch hunt”.
UNGA day 3 - in pictures
Asked why it should be acceptable for a US president to ask a foreign leader to investigate a political opponent, Mr Biden, or his son Hunter, Mr Trump did not say it should be unacceptable.
Instead, he recalled his grievances against Mr Biden, a Democrat, and said it was he who should be investigated.
“You take a look at that call. It was perfect. There was no quid pro quo,” said Mr Trump.
Of his election three years ago? “We are the ones that played it straight.” His opponents, however, then and now, are “radical left socialists, or worse. That's pretty bad.”
The questions about Ukraine and impeachment continued to come.
Only at the end did Mr Trump seem to take a shine to the media, when a Venezuelan journalist asked him about the economic problems in her country and what was he prepared to do about President Nicolas Maduro.
“How are you doing?” Mr Trump asked.
“Pretty bad,” came the reply. “But we are going to make it.”
The US president countered: “And we are helping you.”
After a couple of rough days, Mr Trump had found a friend.