Donald Trump was unharmed after Secret Service agents opened fire on a suspected gunman near the property line of the former president's Florida golf course.

Trump Media stock slips after second apparent assassination attempt in Florida

Donald Trump was unharmed after Secret Service agents opened fire on a suspected gunman near the property line of the former president's Florida golf course.

Monday morning's slide also followed Trump's announcement on Friday that he would not sell his 57% stake in the company. Trump and other company insiders have been barred from selling their shares in Trump Media, but those lockup restrictions are set to expire on Thursday. "No, I'm not selling," Trump told reporters at his golf club in Palos Verdes, California on Friday. The stock surged as much as 25% following that announcement, and trading activity for Trump Media was briefly halted twice due to volatility. Shares closed up 11% Friday at $17.97 per share. At this price, Trumps' 114,750,000-share stake in the company was worth more than $2 billion. But even after Friday's gains, the stock closed barely higher than where it had opened the week. Shares slid nearly 14% and hit fresh all-time lows on Wednesday and Thursday, after the first presidential debate between Trump and his Democratic opponent, Vice President Kamala Harris. Trump Media often acts as a proxy for Trump's political fortunes, and while Trump continues to claim victory in the Sept. 10 debate, political pundits and strategists agree Harris came out on top. As of 11:00 a.m ET Monday, the stock was down more than 55% since its most recent high in July, after the first assassination attempt. Shares were down 74% off the stock's March public trading debut on the Nasdaq. Trump Media's market capitalization stood at roughly $3.4 billion mid-morning on Monday. This is a developing story, please check back for updates.