Trump is not worried about Biden, never has been.
Trump-Biden Timeline
July 25, 2018 - Axios’ Mike Allen publishes a
story that “Trump fears Biden” as his most formidable opponent in 2020.
August 1, 2018 - A POLITICO/Morning Consult
poll shows Biden would beat Trump in a head to head general election, with 44 percent of voters saying they’d choose Biden and 37 percent saying that they’d vote for Trump.
Late 2018 -
Lutsenko told the LA Times that he had numerous conversations with Guiliani on the phone. He also tells the paper that Giuliani pressed him repeatedly to open an investigation on the Bidens and Burisma, even though Lutsenko had seen no evidence of legal wrongdoing.
U.S. Representative Devin Nunes, then-Chairman of the House Intelligence Committee, and three aides, including Derek Harvey, travel to Europe, according to
congressional travel records. Nunes meets with Shokin in Vienna
to dig up dirt on Biden...The timing of the trip was designed to keep its details
secret from Congress, Bondy says.
December 6, 2018 - At the White House annual Hannukah party, Parnas and Fruman hold a private meeting with President Trump and Giuliani, where Trump tasks Parnas and Fruman to pressure the Ukrainian government to investigate the Bidens, according to associates Parnas told around the time and in the ensuing days, according to
CNN.
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https://www.justsecurity.org/66271/timeline-trump-giuliani-bidens-and-ukrainegate/