After many months of being questioned about his citizenship, GOP presidential candidate Ted Cruz finally got his first federal lawsuit, which questions his place of birth.

A Texas attorney named Newton Schwartz is questioning Cruz, who was born in Canada to an American mother and a Cuban father. In the lawsuit, Schwartz stated that the presidential candidate would be violating the U.S. Constitution if he became the president.

According to him, "I have an uncertainty about it and no one has brought this up before." He added that his doubts stemmed from the wording of the constitution.

But as reported by Latino Fox News, Cruz maintained that he's an American citizen by birth due to the fact that despite being born in a different country, his mother is an American citizen. Furthermore, the U.S. Supreme Court has not even questioned his eligibility to run as president.

It's interesting to note that Cruz is not the first presidential candidate to have his citizenship questioned, nor is he the first to be born outside of the country.

Case in point, fellow Republican candidate Marco Rubio has also faced a similar "birther" issue. According to CNN, Rubio faced the same predicament back in 2011 because of the very reason that both of his parents are of Cuban ancestry.

Mario Apuzzo, a lawyer from New Jersey, said that the Florida governor is ineligible because despite being born in America, both of his parents did not become citizens until 1975, Tampa Bay News reported.

However, just like President Obama's citizenship issue, it did not garner traction and here he is now, running against Ted Cruz and Donald Trump for the presidency.

The issue against Cruz's citizenship is what Trump usually shoots against him. However, Cruz just said that instead of focusing on his citizenship, which he had repeatedly maintained as American, he suggested that they should just focus on the candidate who is best prepared to become the president of the United States.

He also fired back at Trump and said that if he keeps on bringing up this issue, Trump would also be ineligible. After all, Donald Trump's mother was born in Scotland.

However, the businessman-turned-politician has since fired back and countered that he was born in the United States -- just like Rubio.

Nevertheless, Cruz noted that the real reason Trump is bringing this up is due to the fact that he is creeping in closer and closer in the polls.

Cruz said, "Since September, the Constitution hasn't changed. But the poll numbers have."