Mark Penn, a top Democratic consultant, blasted New York City Mayor Bill de Blasio (D) for traveling to Germany to join a protest against President Trump, calling the move “unbelievable.”

Penn went after de Blasio for potentially missing the funeral of a New York police officer killed the day before he went to Hamburg, Germany, where Trump was attending the G-20 summit.

“I was stunned, given that the police officer was assassinated, not to really be with the police, not to really be at the funeral. Maybe he is going to come back in time [for the funeral],” Penn said in an interview with radio host John Catsimatidis that aired Sunday on AM 970 in New York.

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“If he doesn’t, it is just unheard of for a New York mayor instead to go off to talk to a German socialist group. It is unbelievable,” said Penn, a former pollster and senior adviser to Bill and Hillary Clinton.

A spokesman for the mayor said the trip continued as planned because it would not conflict with the officer’s funeral, according to reports. De Blasio is scheduled to return to New York on Sunday.

Penn expressed surprise at both the Democratic Party as well as Senate Minority Leader Charles Schumer (D-N.Y.) for leaning too left on the political spectrum in his view.

“As someone who also knew him all the way from the beginning, I’ve been a little surprised [at Schumer],” Penn said, adding that people have observed “that the left and the activists have more and more power.”

He called on the party to move back to the center.

“I am for the Democratic Party to move back to the center. The center is where America is,” he said, adding that he believes their far-left policies leave the American people feeling “disconnected from the Democratic Party” and “left behind.”