“This is not the time to hold talks with Iran. This is the time to increase the pressure on Iran,” Netanyahu told reporters en route to London, where he was hosted by British Prime Minister Boris Johnson and was later scheduled to confer with U.S. Defense Secretary Mark Esper.

Netanyahu’s comments marked rare public discord between the right-wing Israeli leader and Trump on the Iranian nuclear issue. Netanyahu had previously counseled France against its own outreach to Iran.

The Israeli leader, who is fighting for his political life in an election on Sept. 17, regularly touts his influence with Western leaders, especially fellow rightwingers such as Trump and Johnson, as vital for Israeli security. His opponents say his closeness to rightwing figures abroad hurts Israel by making support for it a partisan issue in friendly countries.

On Wednesday, Trump left the door open to a possible meeting with Iranian President Hassan Rouhani at the upcoming U.N. General Assembly in New York, saying: “Anything’s possible. They would like to be able to solve their problem.”

Tehran has rejected any negotiations with Washington unless Trump drops sanctions he imposed after quitting the 2015 Iranian nuclear deal, an agreement Netanyahu had savaged as inadequate.

Iran has said that, starting on Friday, it would begin developing centrifuges to speed up the enrichment of uranium, which can produce fuel for power plants or for atomic bombs. The Iranians deny seeking nuclear weapons.

The centrifuge move would be Iran’s latest reduction of its commitments to restrict nuclear projects under the 2015 deal.

Netanyahu called this “another violation, another provocation by Iran, this time in the realm of its quest for nuclear weaponry”.

Meeting Johnson at 10 Downing Street, Netanyahu praised the politically embattled British leader for his “staunch stance against anti-Semitism and ... support for Israel’s security”.

“We have the challenge of Iran’s aggression and terrorism, and I’d like to talk to you about how we can work together to counter these things for the benefit of peace,” Netanyahu told Johnson, according to an official Israeli transcript.

Like other European partners to the Iran nuclear deal, Britain was worried by the U.S. withdrawal. Johnson, while openly sympathetic to Israel, wants to preserve a vision of Palestinian statehood that has eroded under Netanyahu’s tenure.

Netanyahu - who has doubled as defense minister for the past 10 months, a period of stepped-up Israeli operations against Iranian targets in the region - brought his air force chief and top military mission planner for the London meeting with Esper.

Israeli Foreign Minister Israel Katz told Ynet TV that Netanyahu and Esper would discuss “everything that happens in the space between Syria, Lebanon, Iraq,” an allusion to the often clandestine Israeli military campaign.