Bolton addresses reporters in the White House. Photo: Liu Jie/Xinhua via Getty Images

Former national security adviser John Bolton "refused" to submit a sworn affidavit "describing what he observed in terms of the president's Ukraine misconduct" to House Democrats after the Senate voted not to hear witnesses in President Trump's impeachment trial, Rep. Adam Schiff (D-Calif.) told MSNBC on Wednesday.

Driving the news: Nadler said Wednesday it is "likely" House Democrats will subpoena Bolton and continue investigations into Trump's hold on military aid to Ukraine. Schiff told "The Rachel Maddow Show" that no decision had been made to subpoena Bolton.

What he's saying: ""For whatever reason, [Bolton] apparently was willing to testify before the Senate, but apart from that, seems intent on saving it for his book," Schiff told host Rachel Maddow. "He'll have to answer for that, but at this point we have not made a decision about whether or not to move forward with a subpoena, but it is certainly something that we will be discussing."

Flashback: Bolton said Monday that he would testify in Trump's impeachment trial should the Senate issue a subpoena.

The big picture: The Senate acquitted Trump of abuse of power and obstruction of Congress on Wednesday, with nearly every Republican declining to pursue new information about Trump's Ukraine activities.

Go deeper: Nadler says House Democrats will "likely" subpoena Bolton

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Biden confidants see VP choices narrowing to Harris and Rice

Photos: Tom Williams/CQ-Roll Call, Inc via Getty Images; Win McNamee/Getty Images

Confidants of Joe Biden believe his choices for vice president have narrowed to Sen. Kamala Harris and Susan Rice — and would be surprised if he picks anyone else.

The state of play: This is a snapshot of the nearly unanimous read that we get from more than a dozen people close to him.

An election like no other

Illustration: Eniola Odetunde/Axios

The coronavirus will make the 2020 presidential election different from any in modern history: Voting that begins earlier, results that take longer, mail carriers as virtual poll workers and October Surprises that pop in September.

The big picture: Perhaps 80 million Americans will vote early, by mail or in person, Tom Bonier, CEO of TargetSmart, a Democratic political data firm, tells Axios. That's going to set up more of an Election Season than an Election Day — and increase the odds of national turmoil over the vote count.

Exclusive: Inside McCarthy's new GOP messaging platform

House GOP Leader Kevin McCarthy (R-Calif.). Photo: Tasos Katopodis/Getty Images

House Republican Leader Kevin McCarthy (R-Calif.) has given his GOP colleagues new marching orders for stump speeches between now and November, as incumbents worry about how President Trump's own challenges may strain their re-election bids.

Driving the news: McCarthy delivered a PowerPoint presentation to the GOP conference in person last Thursday at the Capitol Visitor Center, with several members joining via Zoom, lawmakers and aides familiar with the gathering tell Axios.