BRUSSELS, July 26 (CGTN) -- European Commission President Jean-Claude Juncker told new British Prime Minister Boris Johnson that a divorce deal agreed by his predecessor last November was the best and the only deal with the European Union, an EU spokeswoman said on Thursday.

The pair spoke on the telephone for the first time since Johnson took power on a platform of taking Britain out of the EU on October 31 with or without a formal divorce accord.

Johnson told Juncker that the so-called Northern Irish backstop must be abolished to avoid a no-deal Brexit, a spokesman for Johnson said.

Johnson added that the withdrawal agreement reached between former British prime minister Theresa May and the EU would not pass parliament in its current form, the spokesman said.

"President Juncker listened to what Prime Minister Johnson had to say, reiterating the EU's position that the Withdrawal Agreement is the best and only agreement possible – in line with the European Council guidelines," Juncker's spokeswoman Mina Andreeva tweeted in a readout of the phone call.

Juncker also repeated the EU's offer to consider inclusion of any new demands from the UK into a non-binding political declaration that was negotiated to accompany the divorce deal.

The EU would analyze any ideas put forward by the UK, provided they are compatible with the withdrawal agreement, Andreeva tweeted.

"President Juncker reiterated that the Commission remains available over the coming weeks should the United Kingdom wish to hold talks and clarify its position in more detail," she added.