Washington (CNN) The Trump administration has informally notified Congress that it will soon announce the approval of an arms sale to Ukraine involving Javelin anti-tank missiles, a US official and congressional aide told CNN this week.

The formal announcement that the State Department has approved the sale is expected soon and congressional notifications are ongoing. Congress is expected to be supportive of the package.

Bloomberg was first to report that the sale had been informally approved.

Ukrainian President Volodymyr Zelensky specifically brought up Kyiv's desire to purchase additional Javelin anti-tank missiles from the US during his controversial July 25 call with President Donald Trump. Shortly after he made his desire known, Trump responded by telling Zelensky: "I would like you to do us a favor though," asking his Ukrainian counterpart to facilitate investigations into former Vice President Joe Biden and his son Hunter, though there is no evidence of wrongdoing by either Biden.

Two US defense officials told CNN the Ukrainian government's Javelin request predates the July 25 phone call. Though it was mentioned on the call, the request does not appear to have been sped up or slowed as a result of the Trump-Zelensky call and subsequent fallout.

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