Irish Prime Minister Leo Varadkar said that big gaps remain between Britain and the European Union as they try to secure a Brexit deal by next week. Varadkar said Ireland can’t accept a deal at any cost as Britain seeks to renegotiate plans intended to ensure there is no hard border between the Republic of Ireland and the U.K.’s Northern Ireland. Both sides are seeking to reach an agreement before an EU summit next week.

Read: Angela Merkel Tells Boris Johnson That Brexit Deal Is 'unlikely'

Difficult to secure agreement by next week: Varadkar

“I think it’s going to be very difficult to secure an agreement by next week, quite frankly,” Varadkar told Irish broadcaster RTE late Tuesday after a 40-minute phone call with British Prime Minister Boris Johnson. 

“Essentially what the United Kingdom has done is repudiate the deal that we negotiated in good faith with Prime Minister (Theresa) May’s government over two years and have sort of put half of that now back on the table and are saying, ‘That’s a concession’. And, of course, it isn’t really.”

Read: Irish Border Residents Worry About Future If No-deal Brexit

UK still hopes to strike a deal

The comments contradicted Johnson’s office, which said Tuesday that EU intransigence had led to a breakdown in negotiations. The U.K. said, however, that it still hopes to strike a deal. Johnson and Varadkar are expected to meet in person later this week.

Read: Boris Johnson Loses First Major Vote On Brexit, Snap Elections Likely

Johnson says Britain will leave without a negotiated settlement if a deal can’t be reached by the Brexit deadline of Oct. 31. The Times of London reported Wednesday that five Cabinet ministers are threatening to resign if the Conservative government adopts a no-deal Brexit as its central policy.

Read: Britain's Johnson To Irish Leader: Brexit Deal Can Still Be Reached