The RNC bragged that Donald Trump has raised $5 million in less than 48 hours. | Getty RNC touts $5 million in Trump online fundraising since Tuesday

Combined with a joint fundraising committee established with the Republican National Committee, Donald Trump has raised more than $5 million online since Tuesday morning, according to a tweet from a top Republican official.

#BREAKING Since Tuesday morning the @realDonaldTrump campaign and the JFC have raised over 5 million online Advertisement — Sean Spicer (@seanspicer) June 22, 2016

Under the agreement reached last month between the Trump campaign and the RNC, Trump is able to raise money directly for nearly a dozen state parties and the national committee through the Trump Victory and Trump Make America Great Again committees, respectively. Individual donors can contribute nearly $450,000 each.

Trump's campaign announced in an email earlier Tuesday that it had raised more than $2 million in less than 12 hours after the presumptive Republican nominee pledged to personally match donations dollar for dollar up to $2 million.

"Yesterday my father sent his first ever fundraising email for the campaign and predicted it would shatter fundraising records. Once again, my father was right," Donald Trump Jr. wrote in the fundraising appeal.

The announcements come amid great concern in the GOP about Trump's slow fundraising start. His most recent Federal Election Commission filing showed him with just $1.3 million in his campaign account as of June 1.