A public feud between President Donald Trump and his on-again, off-again ally, billionaire Elon Musk, reignited this week after an apparent truce lasted less than a month.

The electric-vehicle maker’s shares fell 5.3% to $300.71 on Monday, after sliding 1.8% Monday, while the S&P 500 dropped 0.1% and Dow Jones Industrial Average rose 0.9%. It was the sixth consecutive drop for shares after an 8.2% jump on June 23, the day after the company launched a self-driving taxi service in Austin, Texas.