András Schiff, an eminent concert pianist who has boycotted strongman rule in Russia and his native Hungary, said on Wednesday that he would no longer perform in the United States because of concerns about President Trump’s “unbelievable bullying” on the world stage.

Mr. Schiff, 71, a towering figure in classical music, said he was alarmed by Mr. Trump’s admonishments of Ukraine; his expansionist threats about Canada, Greenland and Gaza; and his support for far-right politicians in Germany. Mr. Schiff, who was born to a Jewish family in Budapest that witnessed the horrors of the Holocaust, said that Mr. Trump’s calls for mass deportation reminded him painfully of efforts to expel Jews during World War II.

“He has brought an ugliness into this world which hadn’t been there,” Mr. Schiff said in a telephone interview this week from Hong Kong, where he is performing. “I just find it impossible to go along with what is happening.”

So Mr. Schiff decided to stop performing in the United States. He said that he was canceling appearances next spring with the New York Philharmonic and the Philadelphia Orchestra, and a recital tour this fall with a stop at Carnegie Hall.