“Since there’s no formal agreement we can’t say,” he said.

Mr. Kudlow added that China and the United States had made progress on strengthening China’s protections on intellectual property and its valuation of its currency, but that some other issues might slip into a second-phase agreement.

In a speech that was heavy on politics , Mr. Trump credited a program of tax cuts, deregulation and tough trade policy for creating 7 million new jobs so far in his term and encouraging companies to set up shop in the United States. If Republicans took back the House and retained control of the Senate and the White House in 2020, America’s prosperity would continue, the president said.

He predicted the business crowd would vote for him next November.

“The truth is look, you have no choice, because the people we are running against are crazy,” he said to laughter. “O.K.? They are crazy.”

Speaking to an audience in Manhattan that included his son-in-law Jared Kushner and Mr. Kudlow, Mr. Trump said he had delivered on his promises to reverse what he described as a decline in American industry.

“We have ended the war on American workers, we have stopped the assault on American industry, and we have launched an economic boom the likes of which we have never seen before,” Mr. Trump said, to the sound of forks clinking on plates.

Mr. Trump castigated the Democrats’ “outrageous hoaxes and delusional witch-hunts” and talked about the importance of the rule of law, the day before the first public hearings of an impeachment inquiry that threatens his presidency.

“We must protect the constitutional rule of law in our country at all cost,” Mr. Trump said to applause. He boasted of his record of appointing more than 160 federal judges, with another 30 or so expected to clear the Senate in the next two months.