Former Secretary of State Hillary Clinton and President Trump during a 2016 election town hall debate in St Louis, Missouri. Photo: Saul Loeb-Pool/Getty Images

Former Secretary of State Hillary Clinton quickly fired back Monday, after President Trump tweeted about a refuted election theory arguing that Google had manipulated millions of votes in her favor in the 2016 presidential election.

Between the lines: Trump did not directly cite his source for the claim. But the tweet came within minutes of a Fox Business Network segment referring to congressional testimony by Robert Epstein, a behavioral psychologist, who said his research showed "biased search results generated by Google’s search algorithm likely impacted undecided voters in a way that gave at least 2.6 million votes to Hillary Clinton," Politico notes.

  • It appears to be in reference to this study by Epstein, in which only 21 voters were undecided — a notably tiny sample size. Google denies the claims, the Los Angeles Times reports.

Reality check: CNN's Daniel Dale spoke to the study's author, who said Trump was wrong in claiming Google specifically "manipulated" votes or search results. He noted that the maximum figure for votes potentially affected by bias was 10.4 million, not 16 million as Trump had cited.

  • Epstein told the fact-chekcing site PolitiFact, "I have never said that Google deliberately manipulated the 2016 election."

Go deeper: Twitter bans advertising from "state-controlled news media entities"

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What to expect from the final debate of the 2020 election

Trump and Biden at the first debate. Morry Gash-Pool/Getty Image

Watch for President Trump to address Joe Biden as “the big guy” or “the chairman” at tonight's debate as a way of dramatizing the Hunter Biden emails. Hunter's former business partner Tony Bobulinski is expected to be a Trump debate guest.

The big picture: Trump's advisers universally view the first debate as a catastrophe — evidenced by a sharp plunge in Trump’s public and (more convincingly for them) private polling immediately following the debate.

Updated 59 mins ago - Politics & Policy

Coronavirus dashboard

Illustration: Aïda Amer/Axios

  1. Politics: Chris Christie: Wear a mask "or you may regret it — as I did" — Senate Democrats block vote on McConnell's targeted relief bill.
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FBI: Russian hacking group stole data after targeting local governments

FBI Headquarters. Photo: Mark Wilson/Getty Images

Energetic Bear, a Russian state-sponsored hacking group, has stolen data from two servers after targeting state and federal government networks in the U.S. since at least September, the FBI and Cybersecurity and Infrastructure Security Agency said on Thursday.

Driving the news: Director of National Intelligence John Ratcliffe announced Wednesday that Iran and Russia had obtained voter registration information that could be used to undermine confidence in the U.S. election system.