The longer Donald Trump stays in office, the higher the risk that anti-American forces will gain the upper hand in Germany and push it into the arms of Russia and China, veteran German diplomat Wolfgang Ischinger said in an interview.

The chairman of the Munich Security Conference and former ambassador to Washington was speaking to Reuters days before the publication of his book "World in Danger," in which he urges Germans not to give up on the United States because of Trump, while also pressing them to accept more global responsibility.

"The longer Trump remains in office, the harder it will be to stand up to those in this country and elsewhere in Europe who have been arguing since the Vietnam War that we need to cut the cord with America the bully," Ischinger said.