Republican presidential candidate Ted Cruz took a sharp stab at GOP front-runner Donald Trump this week, accusing him of supporting "amnesty" for undocumented immigrants.

During a recent interview with ABC News anchor George Stephanopoulos, Cruz stated that Trump's position on illegal immigration would ultimately amount to amnesty.

"Donald Trump's position is once you deport them, it's what's called touchback. A lot of establishment Republicans had touchback," said the Texas senator. "Basically you make them fly back to their country for a minute, touch the ground, and then they come back with amnesty as citizens. Now, Donald is entitled to do that. He can advance that position, but he doesn't get to pretend that it's not amnesty if he's legalizing 12 million people [who are] here illegally."

Cruz also accused Trump of publicly supporting amnesty in a tweet he sent back in 2013. Around that time, Congress was engaged in a heated showdown over immigration. As a solution, a bipartisan group of senators that included 2016 hopeful Marco Rubio presented the "Gang of Eight" immigration bill that included a pathway of citizenship for undocumented residents.

According to Cruz, Trump also supported giving unauthorized immigrants citizenship and Rubio's Dream Act.

"I would note at that time, right in the middle of the fight, Donald Trump was publicly supporting amnesty. He was supporting Marco Rubio's Dream Act," Cruz said. "He was criticizing Mitt Romney for being too tough on immigration. That's where Donald Trump was in 2013. Now, when he launched his campaign for president, suddenly he discovered illegal immigration was a problem."

Cruz also shared a tweet that Trump sent out in August 2013 to prove that his 2016 rival supports "amnesty."

Cruz then touted the tweet during a Boston Herald Radio interview on Thursday.

"Now in 2013, I was leading the fight against Marco Rubio's 'Gang of Eight' amnesty plan," Cruz said.

"In the middle of that fight, Donald Trump sent out a tweet supporting amnesty, saying we should adopt amnesty. Now, that's a sharp difference," he added.