Here's what you need to know about Sally Yates, who defied Trump and was instrumental in getting Michael Flynn fired

While her exchange with Cruz went viral in political circles, Yates was testifying to address reports as to whether she warned the White House in January about ousted National Security Advisor Michael Flynn's ties to Sergey Kislyak, the Russian ambassador to the US.

Yates said she informed the White House that Flynn could be vulnerable to Russian blackmail just days after Trump's inauguration.

Trump still chose Flynn for the national security advisor post. Flynn, however, was fired less than a month into his tenure after he admitted to misleading Vice President Mike Pence about his conversations with Kislyak.

Yates' journey from relative obscurity to Democrat darling happened quickly. Following her warnings over Flynn, she defied Trump's now-infamous "travel ban," which led to her firing in January.

Yates started her career at the Justice Department three years after graduating from the University of Georgia's law school.

She spent over three decades at the agency, working her way up to district attorney in Georgia's northern district after prosecuting a series of white collar cases, according to CNN. Yates was the first woman to hold that position.

Yates successfully aided the prosecution of

After Eric Holder retired, Obama nominated Loretta Lynch to take Holder's top spot at the Justice Department, with Yates for deputy. Yates was easily confirmed with bipartisan support.

Jeff Sessions, now the attorney general, was one of the few hardline conservatives to vote against Lynch's confirmation.

Yates become a household name after Trump fired her for refusing to cooperate with the White House's first iteration of the executive order temporarily halting refugees and citizens from seven majority-Muslim countries from entering the US in January.

The Yates-led Justice Department said it was caught by surprise by the travel ban.

Yates, then acting attorney general, refused to direct the Justice Department to comply with the executive order, calling it "unlawful" and "indefensible" in court, according to CNN. She added that Trump had undermined the ban's legal grounds by discussing how it was meant to single out Muslims. Trump made those comments while on the campaign trail.

The White House released a statement days later, saying Yates had "betrayed the Department of Justice" by refusing to enact the order. Yates was fired via a hand-delivered letter on Tuesday, January 31 — just four days after she refused to comply with Trump's order.

During her testimony to the Senate on Monday, Yates said the Justice Department wasn't consulted prior to Trump signing the executive order, and that she learned about it "through media reports," per The New York Times.

Michael Flynn, blackmail, and the Russian ambassador

Yates visited the White House shortly after Trump's inauguration, where she told Trump's chief counsel, Don McGahn, that she had "serious concerns" about Flynn.

Yates testified on Monday that she told McGahn that Flynn could be vulnerable to Russian blackmail after he misled Pence about his contacts with Kislyak, the Russian ambassador.

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It goes even deeper. Obama reportedly warned Trump about hiring Flynn when the two met at the White House in November following the election. Obama himself had previously fired Flynn from the Defense Intelligence Agency in 2014. And New Jersey Gov. Chris Christie, who lead Trump's transition team for a brief period, stated that he didn't "see eye-to-eye" with Flynn, Politico reported.

Trump went ahead and hired Flynn anyway, though Flynn was fired less than a month into his tenure after The Washington Post reported on Yates' warnings.

Sparring with Ted Cruz

While Yates' testimony on Monday to the Senate Judiciary subcommittee was ostensibly about Flynn's contact with Russia, the wounds over Trump's failed first travel ban were clearly still raw.

Sen. Ted Cruz, a Republican from Texas, questioned Yates' legal grounds for defying Trump's travel ban in January.

Cruz cited a section of the Immigration and Nationality Act (INA), which provides the president broad oversight to suspend the entry of foreigners he deems as "detrimental " to US interests.

"Would you agree that is broad statutory authorization?" Cruz asked Yates in attempting to make a point that Yates' refusal to comply with Trump's travel ban was a matter of partisan politics.

Yates shot back, bringing up a different provision from the INA that says that "no person shall receive preference or be discriminated against in issuance of a visa because of race, nationality or place of birth."

She added that her concern with the travel ban was not whether it complied with the INA, but whether it violated the Constitution's equal protection clause. Yates maintained that it was important to look at the "intent" behind Trump's actions prior to signing the order.

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Yates, who is 56 years old, is considered by some to be a rising star in the Democrats' orbit. Atlanta's mayor, Kasim Reed, called her "special," and said he hopes she runs for governor in Georgia in 2018.

Natasha Bertrand and Allan Smith contributed reporting.

Here's what you need to know about Sally Yates, who defied Trump and was instrumental in getting Michael Flynn fired

Michael Flynn, blackmail, and the Russian ambassador

Sparring with Ted Cruz

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