(CNN)One prominent Republican leader is defending Ted Cruz's eligibility to run for president despite the Texas senator's Canadian birthplace: Former GOP presidential nominee Mitt Romney.
Mitt Romney: Ted Cruz 'natural born citizen'
The former Massachusetts governor tweeted his support of Cruz on Friday, writing, ".@tedcruz is a 'natural born citizen.' Obama too. Even George Romney. This isn't the issue you're looking for."
Cruz has faced criticism recently after GOP presidential front-runner Donald Trump began publicly questioning whether Cruz is eligible to president, even though he was born in Canada. Constitutional scholars have said it wasn't a problem, and Cruz denounced Canadian citizenship last year.
Trump has also repeated his belief that Cruz has a Canadian passport, which Cruz denied during a separate interview Wednesday with CNN's Dana Bash.
Romney's tweet references the conspiracy theory that arose during President Barack Obama's presidential campaign, when skeptics questioned whether the President was actually born in Hawaii, where he grew up, or Kenya, where his father is from.
Romney also mentions his father, George Romney, who was a Republican Party politician born to American parents in Mexico.