A new Fox News poll released Wednesday evening shows Hillary Clinton jumping to a 10-point lead among registered voters, well above the poll’s 4-point margin of error.

According to the poll, Fox News’ first to include the vice presidential candidates, Clinton-Kaine received 49 percent support while the Trump-Pence ticket garnered 39 percent in a head-to-head run.

Factoring in the Libertarian ticket, Clinton-Kaine (44%) still held a 9-point lead over Trump-Pence (35%), while 12 percent of respondents said they would vote for Johnson-Weld.

Donald Trump has had a rocky couple of weeks. As recently as July 27, the RealClear Politics average gave the Republican nominee a 1.1 percent edge over Democratic rival Hillary Clinton — the greatest lead Trump has held since RCP began tabulating data last July. A mere week later, Trump support has plunged as quickly as it rose.

Statistical analysis site FiveThirtyEight showed similar data on July 30, when Trump briefly surpassed Clinton in their polls-only forecast.

Trump’s plunge in the polls follows the Democratic National Convention and a week of clashing with Khizr Khan, whose son, U.S. Army Capt. Humayun Khan, was killed by a suicide bomber in Iraq in 2004.