Hunter Biden was indicted Thursday on federal firearms charges, the latest step in a long-running investigation into the president’s son that puts the case on track toward a possible high-stakes trial as the 2024 election looms.

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 by a special counsel overseeing the case.

The indictment comes weeks after the collapse of a plea deal that would have averted a criminal trial and distracting headlines for President Joe Biden.

The court fight doesn’t seem likely to end soon. Hunter Biden’s defense attorney argues he didn’t violate the law and remains protected by an immunity provision that was part of the plea deal. The charges, meanwhile, are rarely filed as stand-alone counts and a federal appeals court recently found the measure he was charged under unconstitutional.

He’s also been under investigation for his business dealings, and the special counsel has indicated that tax charges could be filed at some point in Washington or in California, where he lives.

The legal arguing comes as a political fight also plays out. The House has formally opened an impeachment inquiry into the Democratic president, seeking to tie the elder Biden to his son’s businesses and divert attention away from former President Donald Trump’s own legal woes. Trump’s include federal indictments over the handling of classified documents and efforts to overturn his 2020 election loss to Joe Biden.

Republicans have unearthed no significant evidence so far of wrongdoing by the elder Biden, who as vice president spoke often to his son and stopped by a business dinner with his son’s associates. The White House maintains Joe Biden was not involved in his son’s business affairs.

Republicans had slammed the plea agreement that spared Hunter Biden jail time as a “sweetheart deal.” Rep. James Comer, the lead Republican pursing the impeachment inquiry, called the gun charges “a very small start” and pushed for investigation of whether the president was involved in his son’s business dealings. Trump also pointed to the lack of connection to Joe Biden in the gun charge plea agreement.