Republican presidential candidate Donald Trump unleashed a series of Twitter attacks against fellow 2016 hopeful Ted Cruz, who reportedly failed to report not one, but two major loans that he used to finance his 2012 Senate campaign.

Earlier this week, it was reported that the Texas senator failed to disclose a $500,000 loan that he received from Goldman Sachs, when he was running for his U.S. Senate seat in 2012. Cruz, however, dismissed the controversy as an honest "paperwork error."

On Friday, The New York Times reported that the Tea Party favorite also did not submit proper documentation to report a second loan from Citibank that he used during the same race. In a letter he sent Thursday to the Federal Election Commission, Cruz said the "underlying source" of money for a series of personal loans he made to his Senate campaign included both bank loans, totaling about $1 million. The letter stated that both loans were "inadvertently omitted" from the required filings.

The letter, however, did not say what collateral Cruz used to obtain the Citibank loan, which came to as much as $500,000 in a line of credit.

"This failure to disclose to the public meant voters in Texas did not have the required information," said Kent Cooper, a former election commission official, to the NYT.

Trump wasted little time bashing Cruz over his failure to disclose the two loans in several tweets Saturday morning. He wrote: