Don Jr and Kimberly Guilfoyle take Trump fundraising push to London with $100,000-a-ticket dinner next month as former president tries to close cash gap with Biden

Donald Trump Jr. and his fiancée Kimberly Guilfoyle are stepping up their fundraising work for Donald Trump's presidential campaign with a dinner and reception in London next month when tickets cost up to $100,000.

A source familiar with planning said they expect the haul to be in the seven figures.

Although a string of polls suggests Trump is ahead in the battleground states that will decide November's election, he lags behind President Joe Biden's fundraising totals.

Now Don. Jr, 46, and Guilfoyle, 55, will headline a June 5 event in Alabama before flying to London for a major event a week later.

Hosts include Australian actress Holly Vallance, several Trump ambassadors and  financial services billionaire Howard Lutnick.

Kimberly Guilfoyle and her fiancé Donald Trump Jr will headline a major fundraising event in London on Jun. 12 and will continue to work 'aggressively' for the Trump campaign

Attendees can expect to pay $25,000 for a photograph with the hosts, according to an invitation obtained by DailyMail.com. 

'Expect both Don Jr. and Kim to continue to aggressively fundraise for the Trump campaign, especially as we get closer to the fall,' said a source close to Don Jr. and Guilfoyle.

'With the exception of former President Trump himself, no one in the Trump orbit has the ability to consistently raise as much money headlining fundraisers as them.

'They were tier-one fundraisers on the 2020 campaign and will be similarly active on the fundraising circuit this time around.'

Trump's ability to raise funds has been limited by the hush money trial under way in New York, which has kept him in a courtroom for four days a week.

But on Friday (a day off for the court so Trump could attend his son Barron's high-school graduation) he was traveling to Minnesota for a campaign event.

He is due to headline the Lincoln Reagan dinner in St. Paul, one of the biggest fundraisers of the year for the Minnesota Republican Party.

The latest federal filings show he has work to do.

Although the famously penny-pinching billionaire prides himself on getting maximum bang for his buck on the campaign trail, he lags behind Biden in fundraising, according to latest federal filings.

Couples can pay $100,000 to join the 'host committee' or $10,000 to attend

Donald Trump has been confined to a New York courtroom for four days a week for the past month, eating into his campaigning and fundraising opportunities

The London event will also feature former Neighbours actress Holly Valance 

He ended March with $45 million on hand, compared with Biden's $85.5 million.

His most splashy event so far is likely to close the gap. A reception at the Palm Beach, Florida, home of billionaire John Paulson last month netted more than $50 million, according to his campaign.

'It's clearer than ever that we have the message, the operation, and the money to propel President Trump to victory on November,' Team Trump said at the time.

In recent months, a string of well-heeled bankers, investors and financiers have put their doubts to one side to say they will back the former president over Biden.

Lutnick, the founder of Cantor Fitzgerald, said immigration and business regulation were bringing the business world back to Trump.

'The Republican Party is a less regulatory party,' Lutnick told Bloomberg last month. 

'An administration that’s more business-friendly probably is good for stocks, although you can't say lately Joe Biden's not good for stocks.'

Don Jr and Guilfoyle are also hosting an event in Birmingham, Alabama, next month

The couple are one of the most dependable attractions on the MAGA circuit

Both Don Jr. and Guilfoyle have been regular headliners for Trump. 

He was one of the headline names at an event in Washington, D.C., that raised $2 million in March, for example.

Both sides are stepping up efforts to raise cash for what promises to be a desperately close election. 

For his part, Biden is tapping some of Hollywood's biggest celebrities for a Los Angeles fundraiser next month.

Julia Roberts and George Clooney are expected to top the bill.