It will be very difficult to secure a Brexit agreement by next week with big gaps remaining in the British position, Irish Prime Minister Leo Varadkar said following a phone call with his British counterpart, Boris Johnson.

“I’ll certainly work until the very last moment to secure that (a deal) but not at any cost... I think it will be very difficult to secure an agreement by next week, quite frankly,” Varadkar told Irish national broadcaster RTE.

“Essentially what the United Kingdom has done is repudiated the deal that we negotiated in good faith with Prime Minister May’s government over two years and has 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. There are two big gaps.”

Johnson has consistently said the United Kingdom will leave the EU on Oct. 31 with or without a deal, though a law passed by parliament demands he write a letter to the EU asking for a delay if he cannot strike an exit deal by Oct. 19.