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Trump mocks Biden for calling 'a lid' before 9 a.m.

President TrumpDonald TrumpWhite House denies pausing military aid package to Ukraine Poll: 30 percent of GOP voters believe Trump will 'likely' be reinstated this year Black Secret Service agent told Trump it was offensive to hold rally in Tulsa on Juneteenth: report MORE mocked Joe BidenJoe BidenObama: Ensuring democracy 'continues to work effectively' keeps me 'up at night' New Jersey landlords prohibited from asking potential tenants about criminal records Overnight Defense: Pentagon pulling some air defense assets from Middle East | Dems introduce resolution apologizing to LGBT community for discrimination | White House denies pausing military aid package to Ukraine MORE on Thursday after the Democratic presidential nominee's campaign called a "lid" on activities for the day early in the morning, saying Biden would be preparing for Tuesday night's debate. 

Trump, whose campaign has ripped Biden for not doing more press events while seeking to raise questions about the Democrat's age, stamina and mental acumen, called Biden "sleepy" and "low energy," insults he has repeatedly hurled, 

"Sleepy Joe Biden just closed down his campaign for the day (Again)," Trump tweeted. "Wants to rest! He is a very LOW ENERGY INDIVIDUAL, and our Country cannot make it in these exciting, but complex and competitive times, with a Low Energy President !!!" 

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The Biden campaign called the lid, a memorandum for reporters covering the campaign indicating there will be no further availability or public statements that day, shortly after 9 a.m. on Thursday. 

According to pool reports, Biden told reporters on Wednesday, “I’ve started to prepare but I haven’t gotten into it really heavily. I will beginning tomorrow."

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It is not unusual for a candidate to dig into debate prep work days before a presidential debate. Tuesday's debate will serve as one of the chief opportunities for Trump to change the direction of the campaign; polls show him trailing Biden nationally and in key swing states, though a new survey released Wednesday showed Trump ahead in the important states of Florida and Arizona.

Biden has kept out of the public eye for much of his campaign, a strategy that appears to have boosted him in polls this spring and summer as attention focused on Trump. Yet it has also at times worried Democrats, who argue he needs to be in the public eye and should not play things too safely.

Trump has repeatedly accused Biden of "hiding" from reporters or any meaningful scrutiny, while suggesting the former vice president has dementia. Both men are in their 70s. 

"Joe doesn't know he's alive," Trump said during an interview with Fox News's Chris WallaceChristopher (Chris) WallaceSunday shows - Biden foreign policy in focus Pompeo defends Trump on Russia in Chris Wallace interview Lewandowski says Trump has not spoken to him about being reinstated MORE, who will moderate Tuesday's debate, earlier this summer. 
 
Biden has brushed aside these attacks from Trump and his allies, saying the president is trying to distract from what Biden says is a botched response to the coronavirus pandemic and other failures during his first term.