Former White House staffer Ronnie Cho is strongly considering a congressional run in Arizona, sources tell the Washington Examiner.

Cho, the former associate director for the White House's Office of Public Engagement, has been taking calls encouraging him to run in Arizona since Democratic Rep. Ed Pastor announced Thursday he would retire after his current term.

Sources close to Cho, a Phoenix native and Arizona State University alumnus, said he is seriously thinking of throwing his hat into the ring in Arizona's 7th Congressional District. If successful, he would be the first Korean-American Democrat elected to Congress.

Cho also has been an editor at Newsweek/Daily Beast and worked at the U.S. Department of Homeland Security as associate director in the Office of Legislative Affairs.

The former campaign staffer was featured prominently in HBO's documentary about President Obama's election in 2008, called "By the People: The Election of Barack Obama." Reviewing the documentary, Politico called Cho the "heart and soul of the film."

If he does step into the race, the first-generation Korean-American would face a slew of seasoned political opponents: Arizona State Rep. Ruben Gallego, Maricopa County Supervisor Mary Rose Wilcox and Democratic state Sen. Steve Gallardo are all Democrats who have indicated their intention to run, according to Reuters.