FILE PHOTO - Labour Party's Shadow Secretary of State for Departing the European Union Keir Starmer talks to the media as he arrives at the EU Commission headquarters for Brexit talks with officials, Brussels, Belgium November 7, 2018. REUTERS/Francois Lenoir

LONDON (Reuters) - Prime Minister Theresa May’s Brexit deal should be put to a second referendum if it is passed by parliament, the Brexit spokesman for the opposition Labour Party Keir Starmer said on Tuesday.

On Monday, Labour said it would back calls for a second plebiscite on Brexit if lawmakers rejected its alternative plan for leaving the European Union.

Starmer said the second vote would be between remaining in the EU and the option of a “credible leave deal”, one that had parliament’s backing.

“If the prime minister’s deal gets through, that deal should be subject to the lock, if you like, of a public vote,” Starmer told BBC radio.