(AP Photo/Jae C. Hong)
Donald Trump.
Donald Trump is continuing his attacks on Republican presidential rival Sen. Ted Cruz (R-Texas), a day ahead of the Iowa caucuses.
In a series of tweets Sunday morning, Trump slammed Cruz for sending out campaign mailers telling Republicans that they were in "voting violation" for not participating in past elections.
"The Cruz campaign issued a dishonest and deceptive get out the vote ad calling voters 'in violation.' They are now under investigation. Bad!" Trump tweeted.
The mogul also reiterated several criticisms that he's leveled at Cruz in recent weeks, as the two candidates have battled for victory in the first-caucus state of Iowa.
He suggested the senator was not electable in November's general election and that he misled voters by failing to disclose loans from Goldman Sachs and Citibank during his 2012 Senate run:
Trump also went after Bob Vander Plaats, the Iowa conservative leader who is the president and CEO of The Family Leader. Vander Plaats endorsed Cruz for president.
Trump claimed that Vander Plaats only endorsed Cruz to spite Trump for not providing the influential conservative activist a hotel room and refusing to pay him $100,000 to show up at an event.
For his part, Cruz has gone on the attack against Trump. He said during a CNN interview Sunday that Trump skipped Thursday's Republican debate because he was too afraid to field questions about how he has changed positions on key issues.