Mr Johnson narrowly secured the position after prolonged negotiations.
Mr Trump added that Mr Johnson would “do the right thing.”
“That is not the way we do things in the House, and I think that would be a terrible precedent to set,” said Mr Johnson.
“This nation was founded on the principle that there are no kings in America…. No one, no one is above the law. Not even the president of the United States,” Mr Biden said.
After months of obstruction, the U.S. House of Representatives had approved a nearly $61 billion aid package for Ukraine.
