The leader of the United Kingdom Independence Party (UKIP) Nigel Farage slammed President Barack Obama Friday as the “most anti-British president” in U.S. history.

Obama already sparked outrage from some for favoring that Britain remain in the European Union. The British people will decide for the first time in 40 years on Jun. 23 whether the country will remain in the European Union or whether it will leave and forge a new path outside the EU.

Obama will visit the UK on April 21 where he will voice support for Prime Minister David Cameron and the campaign to keep Britain in the EU, before heading to Germany for meetings with Chancellor Angela Merkel.

“Mercifully, this American president, who is the most anti-British American president there has ever been, won’t be in office for much longer, and I hope will be replaced by somebody rather more sensible when it comes to trading relationships with this country,” Farage said, according to Sky News.

More than 100 members of parliament signed a letter to London’s U.S. ambassador in March warning Obama to avoid intervening in the UK’s referendum.

The letter, which was organized by the former secretary of state for defense — a prominent supporter of Britain exiting the EU — says Obama’s open support for the “Remain campaign” would be “highly damaging” and would erode the “validity of the result.”

“It has long been the established practice not to interfere in the domestic political affairs of our allies and we hope that this will continue,” the letter states.

“While the U.S. administration may have a view on the desirability or otherwise of Britain’s continued membership of the E.U., any explicit intervention in the debate is likely to be extremely controversial and potentially damaging.”

“We hope that you will persuade President Obama from becoming embroiled in what is a highly delicate, sensitive and important issue for the British people.”

“It is not for others around the world to try to encourage people to vote one way or the other,” leader of the House of Commons and Conservative cabinet minister Chris Grayling added.

“It is really quite important that our allies look at this as a decision for British people. Whether we are inside or outside the European Union does not affect our relationship with the United States,” he continued.

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