Sen. Jon Tester of Montana was already facing a tough re-election battle in a state that Donald Trump won by a landslide — and then the Green Party made the Democrat’s job that much tougher by qualifying for the ballot.

Now the Montana Democratic Party is scrambling to oust the Greens. It has asked a judge to decertify the left-wing party by declaring 180 petition signatures invalid for reasons such as bad handwriting, use of initials instead of full names and failure to write in cursive.