Gov. Chris Christie is promising "very swift action" if gay marriage legislation makes it to his desk.

The Republican governor, who opposes same-sex nuptials, has vowed to veto the bill. It's due to go before the Assembly on Thursday, three days after it passed in the state Senate.

At a news conference on Monday, Christie virtually guaranteed that the Legislature would not muster the votes needed to override his veto. Support from Republican lawmakers would be needed to overturn Christie in both the Senate and Assembly.

Christie accused Democrats of engaging in political theater by moving a gay-marriage bill through the Legislature knowing he wouldn't sign it. He says that hopefully, lawmakers will soon be able to "move on" from the issue.

(Copyright 2012 by The Associated Press. All Rights Reserved.)