President Donald Trump has proposed taking over Canada and Greenland, imprisoning U.S. citizens overseas and serving an unconstitutional third term. Most Americans say they think he’s serious about each proposal.

Released on Tuesday, the poll found that 86 percent of Americans oppose the United States trying to take control of Canada, 80 percent oppose Trump serving a third term, 76 percent oppose trying to take control of Greenland and 66 percent oppose sending U.S. citizens to foreign prisons.