Fox News host Sean Hannity on Monday compared the investigation into possible ties between President TrumpDonald John TrumpWayfair refutes QAnon-like conspiracy theory that it's trafficking children Stone rails against US justice system in first TV interview since Trump commuted his sentence Federal appeals court rules Trump admin can't withhold federal grants from California sanctuary cities MORE's campaign and Russia to the "birtherism" conspiracy theory that claims former President Barack ObamaBarack Hussein ObamaObama: 'Voting by mail shouldn't be a partisan issue' How cable TV and sensationalized crime reporting led to 'cancel culture' Judge again blocks US from resuming federal executions MORE wasn't born in the United States.

Speaking to Trump lawyer Jay Sekulow on his show, Hannity accused Trump's critics of pursuing the Russia investigation with the same fanaticism as "birther" conspiracy theorists.

"This has now become, like, 'Russia-Trump-conspiracy-birther-conspiracy,'" Hannity said as he began the interview. 

"Right," Sekulow agreed.

Twitter jumped on Hannity for the comparison.

Hannity is an outspoken defender of Trump, who frequently questioned Obama's heritage during the Obama presidency. Hannity once interviewed Trump about Trump's support for the conspiracy theory, including Trump's efforts to send investigators to Hawaii during Obama's second term to determine if Obama's birth certificate was real.

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In 2011, Hannity asked Trump about his efforts to investigate Obama's birth certificate during an interview about Trump's political aspirations. In subsequent television appearances, Hannity defended Trump and other supporters of the birther conspiracy theory.

Hannity said on a Fox News panel in 2011 that "all Donald Trump said was 'show the birth certificate and move on.'"

In a 2011 interview with TV host Jerry Springer, Hannity again defended the conspiracy, shouting down Springer when he tried to mention Obama's race as a reason for the conspiracy theories.

"Don't bring up race. Do not bring up race. Do not bring up race," Hannity told Springer in 2011. "It is a constitutional requirement."