Pro-Palestinian protesters call Biden a 'war criminal' as they swarm Radio City music hall ahead of his $25million fundraiser with Obama, Clinton, Lizzo and Stephen Colbert

Pro-Palestinian protesters swarmed Radio City Music Hall Thursday night ahead of President Joe Biden's glitzy $25 million fundraiser alongside former Presidents Barack Obama and Bill Clinton. 

Biden was called a 'war criminal' by those gathered, with one demonstrator holding up a sign that read, 'Joe Biden Retire B****,' a message aimed at the 81-year-old leader.

One video, shared by conservative commentator Charlie Kirk, shows a man getting shoved by members of the crowd and asking for police to assist. 

'Democrats you can't hide, we charge you with genocide!' protesters shouted out, with drum beats helping them keep the time.  

The trio of presidents have been at the venue for most of the afternoon - taping a podcast with comedians Jason Bateman, Sean Hayes and Will Arnett for an episode of their SmartLess podcast. 

Meanwhile, Donald Trump went to the wake of slain NYPD officer Jonathan Diller and met with his grieving family after he was gunned down in the line of duty. 

The former president, 77, called for respect for law and order and criticized the system that allowed the suspected gunmen to be free after 21 arrests.

Videos shared to social media by attendees show loud music playing as donors took their seats, with audience members seemingly unaware of the chaos happening outside. 

Earlier Thursday, Biden arrived in New York with Obama in tow to New York's John F. Kennedy International Airport. 

On the flight Obama could be heard briefly saying hello to the White House press corps, as press secretary Karine Jean-Pierre told reporters the conversation was off the record. 

Obama's involvement with the Biden campaign comes after several reports said the 62-year-old ex-president has been sounding the alarm about Biden's reelection prospects.

At the Thursday night event the Democratic trio of presidents will hobnob with some of the richest donors.

They will be interviewed by CBS Late Show host Stephen Colbert. 

The Office and The Mindy Project star Mindy Kaling is set to emcee.  

Donors at the Democratic bash will be entertained by musical guests Lizzo, Queen Latifah, Ben Platt, Cynthia Erivo, and Lea Michele. 

And for those willing to fork over $100,000 to the Biden campaign, they can have their picture taken with all three presidents. 

Time Magazine's cover story last week chronicled two in-person meetings Obama had with Biden last year - one in June and then a follow-up in December, when the ex-president didn't see the president's campaign operation improve. 

'He expressed concern the re-election campaign was behind schedule in building out its field operations, and bottlenecked by Biden's insistence on relying upon an insular group of advisers clustered in the West Wing,' Time wrote, citing a Democratic insider. 

A follow-up story in The New York Times Tuesday said that Obama is regularly dialing Biden - but he's also phoning White House Chief of Staff Jeff Zients too. 

A senior aide told the paper that Obama has 'always' been worried about a Biden loss to Trump, and so he's prepared to 'eke it out' alongside his former VP through Election Day in November. 

Obama's reported warnings are similar to what Clinton was saying behind closed doors ahead of the 2016 presidential election, which saw his wife, Democrat Hillary Clinton, shockingly lose to Trump, who had never held elected office. 

In the book Shattered: Inside Hillary Clinton's Doomed Campaign authors Amie Parnes and Jonathan Allen detailed how Bill Clinton feared that his wife and her campaign aides were taking some support for granted. 

He suggested she go into communities that wouldn't necessarily naturally vote for the Democrat just to show she was making an effort. 

'He knew there was some power just in showing up,' co-author Allen said in a 2017 interview with ABC News. 

Obama has reportedly advised Biden that his field operations are being built out too slowly - bottlenecked by the president's reliance on a 'insular group of advisers clustered in the West Wing,' Time said. 

During Obama's 2012 reelection campaign - which he successfully won against Republican Mitt Romney - he had hired 900-plus staffers by summer. 

The Biden campaign, which is headquarted in Biden's adopted hometown of Wilmington, Delaware, ended 2023 with just around 70 paid employees, though there's a goal to hire 350. 

Biden's team said that the campaign is also planning to rely on staff at the Democratic National Committee to aid the state-level effort.