Giuliani: Biden not 'smart enough' to be president

President TrumpDonald John TrumpTrump pushes back on recent polling data, says internal numbers are 'strongest we've had so far' Illinois state lawmaker apologizes for photos depicting mock assassination of Trump Scaramucci assembling team of former Cabinet members to speak out against Trump MORE’s personal attorney Rudy GiulianiRudy GiulianiTrump retweets baby elephant video Epstein death sparks questions for federal government Booker, Biden's 'Kool-Aid' exchange was second debate's top-tweeted moment MORE said he doesn’t think former Vice President and current 2020 frontrunner Joe BidenJoe BidenEight Democratic presidential hopefuls to appear in CNN climate town hall Hill Reporter Rafael Bernal: Biden tries to salvage Latino Support Biden, Buttigieg bypassing Democratic delegate meeting: report MORE is capable of being president because he's not "smart enough." 

“I don’t think the guy’s smart enough to be president of the United States,” Giuliani told Hill.TV during an interview that aired on Monday. “I’ve known Joe for a long time.”

The former New York City mayor also doubled down on calls for the Biden family to be investigated. He cited some business dealings by Biden's son, Hunter Biden, that took place in China and Ukraine when his father was still vice president. 

“I also think his activities in Ukraine and China should be seriously investigated,” Giuliani told Hill.TV. “It’s a Democratic press that’s protecting him and they’re actually going easy on him.”

The Biden campaign declined Hill.TV’s request for comment.

Trump allies and conservatives have long claimed that the Biden's have been involved corrupt business dealings. Earlier this year, conservative author Peter Schweizer claimed that Hunter Biden inked a deal with the Chinese government in 2013, just days after then-Vice president Joe Biden visited the country. 

Their concerns also center around whether Joe Biden demanded the resignation of former Prosecutor General Viktor Shokin when Shokin was investigating Burisma, where Hunter Biden was a board member at the time. But Ukraine’s top prosecutor said in May that he found no evidence of wrongdoing.

Both Biden and his son have also shot down the accusations. In an interview with ABC News earlier this month, Hunter Biden directly addressed some of allegations, calling them “demonstrably false," and said they were narratives that have been created by "the right-wing political apparatus."

However, Giuliani said that he hasn’t ruled out a trip to Ukraine to meet with the country’s leaders and ask them to pursue an investigation. 

In May, Giuliani announced and then subsequently cancelled plans to travel to Ukraine to ask the Ukrainian government to look into the origins of special counsel Robert MuellerRobert (Bob) Swan MuellerTrump calls for probe of Obama book deal Democrats express private disappointment with Mueller testimony Kellyanne Conway: 'I'd like to know' if Mueller read his own report MORE’s Russia probe and Biden’s past influence in the country.

“I could — I like the Ukraine,” he told Hill.TV. “I think the Ukraine is a great country, I think it is riddled with corruption.”

Giuliani’s comments come amid reports that he helped establish a backchannel with top Ukrainian officials.

Buzzfeed News reported Monday that two U.S. operatives reporting to Giuliani met with Ukrainian officials in an attempt to gather information to use in the 2020 presidential election. They also reportedly sought to push Ukrainian prosecutors to investigate Biden. 

Story updated at 5:00 P.M. EST.

—Tess Bonn