Plaid Cymru leader Rhun ap Iorwerth has said the next prime minister will be Sir Keir Starmer.
Mr ap Iorwerth predicted Labour will win the election however Wales votes.
But he urged Wales’ voters to back the pro-independence party to stop Labour having a “huge majority” that would allow them to act with “impunity”.
It follows Conservative Grant Shapps warning Labour could win a “super majority”.
The BBC is interviewing all the major party leaders in the run-up to the election in The Panorama Interviews with Nick Robinson. You can watch the interview with Rhun ap Iorwerth on BBC iPlayer.
