WASHINGTON — Hunter Biden was indicted Thursday on federal firearms charges, the latest and weightiest step yet in a long-running investigation into the president’s son.

Biden is accused of lying about his drug use when he bought a firearm in October 2018, a period when he has acknowledged struggling with addiction to crack cocaine, according to the indictment filed in federal court in Delaware.

President Joe Biden’s son has also been under investigation for his business dealings. The special counsel overseeing the case has indicated that charges of failure to pay taxes on time could be filed in Washington or in California, where he lives.

The indictment comes as congressional Republicans pursue an impeachment inquiry into the Democratic president, in large part over Hunter Biden’s business dealings. Republicans have obtained testimony about how Hunter Biden used the “Biden brand” to drum up work overseas, but they have not produced hard evidence of wrongdoing by the president.

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Biden Lied on Gun Purchase Form: Indictment

The indictment says Hunter Biden lied on a form required for every gun purchase when he bought a Colt Cobra Special at a Wilmington, Delaware, gun shop in October 2018. He’s accused of checking a box falsely saying he was not a user of or addicted to drugs and of illegally possessing the gun as a drug user.

A felony gun charge against Hunter Biden, 53, had previously been part of a plea deal that also included guilty pleas to misdemeanor tax charges, but the agreement imploded during a court hearing in July when a judge raised questions about its unusual provisions.

Defense attorneys have argued that a part of the deal sparing Hunter Biden prosecution on the gun count if he stays out of trouble remains in place. It includes immunity provisions against other potential charges. Attorneys indicated they would fight additional charges filed against him, but did not immediately respond to a request for comment Thursday.

Prosecutors, though, maintain the agreement never took effect and is now invalid. They telegraphed charges were coming earlier this month.

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Republicans Assailed Previous Plea Bargain for Biden

Republicans had denounced the plea agreement as a “sweetheart deal.” It would have allowed Hunter Biden to serve probation rather than jail time after pleading guilty to failing to pay taxes in both 2017 and 2018.

His personal income during those two years totaled roughly $4 million, including business and consulting fees from a company he formed with the CEO of a Chinese business conglomerate and the Ukrainian energy company Burisma, prosecutors have said.

Congressional Republicans have continued their own investigations into the Justice Department’s handling of the case as well as nearly every aspect of Hunter Biden’s business dealings, seeking to connect his financial affairs directly to his father. They have failed to produce evidence that the president directly participated in his son’s work, though he sometimes had dinner with his son’s clients or said hello to them on calls.

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