Crowd aims 'lock him up' chant at Obama during Trump rally

A crowd at President TrumpDonald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE's rally Sunday evening chanted "lock him up" after the president accused his predecessor, former President Obama, of being caught "spying" on the 2016 Trump campaign.

During the event in Henderson, Nev., Trump told attendees that the former president "got caught spying on my campaign," referring to longstanding accusations from him and his allies that the investigation into the Trump campaign’s contacts with Russia in 2016 was orchestrated by the Obama administration in an attempt to sink his candidacy, a claim for which there is no evidence.

In response, many attendees began chanting "lock him up," a riff on the "lock her up" chant the president encouraged during his 2016 run against then-Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonThe Memo: Trump furor stokes fears of unrest Bloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close MORE, during which he alleged that his opponent had committed crimes by operating a private email server as secretary of State.

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The president has ratcheted up his rhetoric aimed at Obama in recent months, accusing the former president in June of committing "treason" while touting the upcoming results of the Justice Department's investigation into the origins of the probe into the Trump campaign.

“Treason. Treason. It’s treason,” Trump told CBN News in June.

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“They’d been spying on my campaign,” the president added at the time. “Turned out I was right. Let’s see what happens to them now.”

His repeated baseless claims come as the Justice Department's own inspector general previously told the Senate late last year that neither the former president nor former Vice President Joe BidenJoe BidenBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Joe Biden should enact critical government reforms if he wins MORE, the 2020 Democratic presidential nominee, were involved with the decision to begin the investigation.

“We certainly didn’t see any evidence of that in the FBI’s files or the department’s files," he told the Senate Judiciary Committee in December.