Trump campaign calls for $100K in donations by the end of the day
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The Donald TrumpDonald John TrumpTrump nominates ambassador to Turkey Trump heads to Mar-a-Lago after signing bill to avert shutdown CNN, MSNBC to air ad turned down by Fox over Nazi imagery MORE campaign sent its first "emergency" fundraising email to supporters Saturday, seeking to raise at least $100,000 by the end of the day. 

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That request follows a multimillion-dollar ad blitz launched by likely general election rival Hillary ClintonHillary Diane Rodham ClintonOvernight Defense: Trump declares border emergency | .6B in military construction funds to be used for wall | Trump believes Obama would have started war with North Korea | Pentagon delivers aid for Venezuelan migrants Sarah Sanders says she was interviewed by Mueller's office Trump: I believe Obama would have gone to war with North Korea MORE this week.

"Right now we're facing an emergency goal of $100,000 to help get our ads on the air," the email said. "We need your contribution by 11:59 P.M. Tonight." 

"Crooked Hillary is about to invade your TV with ads attacking Mr. Trump. But we're preparing to fight back," it reads, adding the campaign plans to attack Clinton over her role in Benghazi and the FBI probe into her use of a private email server while secretary of State. 

Clinton, the presumptive Democratic presidential nominee, this week launched a multimillion-dollar ad blitz in eight swing states, her first geared toward the general election. 

Meanwhile, Republican leaders have worried about Trump's fundraising operation as he mounts a general election campaign against Clinton's well-oiled machine. 

Several prominent GOP donors have said they would keep their wallets shut this cycle and not support the unconventional candidate. 

But Trump, the presumptive GOP nominee, has recently said there's "no reason" for his campaign to raise his previously pledged $1 billion for the general election. 

“There’s no reason to raise that,” he said earlier this month. "I just don't think I need nearly as much money as other people need because I get so much publicity."

During the Republican primary, Trump often bragged about his largely "self-funded" campaign, but he's shown increasing willingness to court donors as next month's Republican National Convention in Cleveland draws closer.