The State Department has informally notified Congress that it approved a potential $39 million sale of Javelin anti-tank missiles to Ukraine, a congressional aide confirmed to The Hill.

The approval was first reported by Bloomberg, which said a formal announcement could come later Tuesday. The aide told The Hill a formal announcement should come “soon.”

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The sale covers 150 Javelin missiles and 10 missile launchers, the aide said.

The approval of the sale comes as House Democrats pursue an impeachment inquiry into 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, in part over his handling of U.S. military aid to Ukraine.

The Javelins are separate from almost $400 million in aid that was held up earlier this year, but they have still come under scrutiny after they were mentioned in the July call between Trump and Ukrainian President Volodymyr Zelensky that's at the center of the impeachment inquiry.

A State Department official declined to comment to The Hill ahead of the formal announcement.

Democrats are probing whether Trump pressured Ukrainian leaders to investigate former Vice President 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, who is leading Trump in several 2020 polls, and his son, as alleged in a whistleblower complaint.

Among the questions is whether Trump held up military aid to Ukraine, which is battling Russian-backed separatists, as leverage.

About $400 million in aid for Ukraine approved by Congress was held up over the summer before being released Sept. 11.

Trump has acknowledged holding up the money, but has alternately said he did so because of concerns about corruption or because he believes Europe is not contributing enough to Ukraine.

The United States first sold Ukraine more than 200 Javelin missiles and related equipment in 2018.

In the July call, Zelensky told Trump his country was almost ready to buy more Javelins, according to a rough transcript of the call released by the White House last week.

Immediately after Zelensky mentioned the Javelins, according to the rough transcript, Trump said, “I would like you to do us a favor though” and asked Zelensky to look into CrowdStrike, a U.S.-based internet security company that initially examined the breach of the Democratic National Committee’s servers in 2016.

On the call, Trump also asked Zelensky to work with his personal attorney Rudy Giuliani Rudy GiulianiThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting CIA found Putin 'probably directing' campaign against Biden: report Democrats fear Russia interference could spoil bid to retake Senate MORE and Attorney General William Bar to investigate Biden’s role in the firing of a Ukrainian prosecutor, according to the transcript.