He endorsed Trump later that month and has since become a confidant of the Republican billionaire, appearing with him at rallies and serving as a liaison to party leaders.
Although the fundraiser is for Christie and New Jersey's state Republican Party, the national Republican Party is not involved in the fundraiser, according to the report.
The people told of the event, who requested anonymity to speak about private conversations, said Christie - who was spotted at Trump Tower on Friday morning - worked personally with Trump to arrange the reception.
Republican National Committee chairman Reince Priebus made the rounds of broadcast and cable news shows Wednesday calling for his party to unite behind Trump as Kasich, the governor of OH, ended his campaign less than 24 hours after Sen.
Donald Trump is coming to New Jersey, but it will cost you at least $200 to see him.
Christie dropped out of race following the New Hampshire Primary in February.
Another 37 percent say picking Christie for the ticket would not have an impact either way. Christie has already thrown his lot in with Trump and would be quite a successful attack dog, allowing Trump to pivot toward being more palatable to the general voter.
"One, I don't think I'm going to be asked", Christie said. Some experts say Christie could be a contender for Trump's pick for vice president.
New Jersey's June 7 primary was made less dramatic this week when Senator Ted Cruz and Ohio Governor John Kasich exited the race.
The Monmouth poll of 301 likely Democratic voters and 301 likely Republican voters was taken Sunday through Tuesday and has a margin of error of plus or minus 5.7 percentage points.