Sweden’s left-leaning minority government was on the verge of collapse Tuesday after a far-right party, the Sweden Democrats, said it would side with the opposition to vote against a proposed budget in an attempt to force the government to resign. Options for Prime Minister Stefan Lofven, a Social Democrat, appeared limited: He could withdraw the budget plan, which would postpone the vote set for Wednesday, resign or wait until Dec. 29 to call for a new election.