Democratic strategists say allegations that President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE asked Ukrainian President Volodymyr Zelensky to investigate Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE and his family will help the former vice president’s cause in trying to win the Democratic nomination.

The strategists — unaffiliated with any of the presidential campaigns — say Trump’s actions suggest he feels the most threatened by Biden as an opponent in the general election.

“I think it says they're afraid of him,” said Democratic strategist Karen Finney. “They’re putting time, resources and energy in preparing to take on Biden and that surely does say something.”

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Democratic strategist Eddie Vale agreed: “Although I still subscribe to the theory it's too early … I definitely agree it's a sign team Trump is most worried about Biden.”

To be sure, other Democrats interviewed for this piece wondered whether the scrutiny on Biden and his son Hunter Biden’s work in Ukraine would be an unwanted narrative for the former vice president.

Trump has said he brought up the Bidens with Zelensky in the context of corruption, and without offering any evidence on Monday he suggested that if a Republican had done what Joe Biden had done, he would have got the electric chair.

No evidence has emerged that Joe Biden did anything improper regarding Ukraine, and his campaign has pressed the media to handle the issue with care.

“These aren’t the kinds of stories you want to be talking about on the campaign trail,” said one Democratic strategist who has worked on presidential campaigns. “You want anything but these kinds of stories, even if they’re not true.”

In recent weeks, after a string of verbal flubs, some Democrats have wondered if Biden has the tenacity and scrappiness to take on Trump.

And as Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) has climbed in recent polls, they have questioned whether Biden’s electability argument is losing luster with Democratic voters.

Biden initially reacted carefully to the new Trump controversy.

“Not one single credible outlet has given any credibility to his assertions,” Biden told reporters. “So I have no comment except that the president should start to be president.”

But hours later, Biden reacted with anger — and tied his answer to Trump’s fear of running against him. This has been an underlying message and even a reason for Biden’s presidential campaign.

“To get on the phone with a foreign leader who is looking for help from the United States and ask about me and imply things — this is outrageous,” he said sternly. “Trump is using this because he knows I’ll beat him like a drum and is using the abuse of power and every element of the presidency to try to do something to smear me.”