Former White House chief strategist Stephen Bannon on Monday characterized some Democratic presidential candidates as “running like they are running for student council president” by not talking about issues related to China, Iran and Venezuela.

During an appearance on Fox Business, Bannon specifically pointed out poll numbers for Sen. Kamala Harris Kamala HarrisHarris faces pivotal moment with Supreme Court battle Nearly 40 Democratic senators call for climate change questions in debates Joe Biden has long forgotten North Carolina: Today's visit is too late MORE (D-Calif.), South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegThe Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice Hillicon Valley: FBI, DHS warn that foreign hackers will likely spread disinformation around election results | Social media platforms put muscle into National Voter Registration Day | Trump to meet with Republican state officials on tech liability shield MORE (D) and former Rep. Beto O'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE (D-Texas), who are all polling in single digits and trailing the front-runner, former Vice President Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE, by at least 30 points in the RealClearPolitics average of polls.

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"As you look at that landscape, who would you say is the biggest threat for Donald Trump in 2020?" host Trish Regan asked the former executive editor of Breitbart News.

"Well, listen, since I think these election are not about persuasion but mobilization, and looking off of 2018, well, [Democrats] did a great job," Bannon said while speaking from Paris. "Remember in the House races, they beat us 52-46, I think they got 6 or 8 million votes more. 2018 should be studied in detail. It’s about mobilization."

He went on to say that some candidates are not focused on larger international issues.

"They have some terrific young candidates, but nobody has broken out," Bannon said. "I think one of the reasons they are in single digits, is Kamala Harris, Mayor Pete, Beto, across the board, they are running like they are running for student council president. They are not talking about China. They’re not talking about Iran. They’re not talking about Venezuela.

"This is a very dangerous world right now, and President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE has got a very same policy he’s going through. This is almost like 1930s to a degree," Bannon concluded. "We're going through a dark valley against very tough individuals, and a lot of — as President Trump calls them, are 'bad hombres,' OK? And you hear debates, it is like the United States exists on an island. That is not the case."

Bannon has repeatedly focused on China in recent interviews, including with CNBC last week.

“China has been running an economic war against the industrial democracies for now 20 years,” he said in an appearance on "Squawk Box" on May 15.

“There is no chance that Donald Trump backs down from this. I think he’s looking at the good of people on a global basis,” he added.

Bannon departed in the White House in August 2017 after seven months as Trump's chief strategist.