WATCH: Former Republican Rep. Adam Kinzinger speaks at 2024 Democratic National Convention

Former Rep. Adam Kinzinger, a Republican from Illinois, spoke Thursday on the final night of the Democratic National Convention in Chicago, an evening focused on the future as Kamala Harris formally accepts her party’s nomination for president.

Watch Kinzinger’s remarks in the player above.

Kinzinger spoke against his party and their support of former president Donald Trump.

“The Republican Party is no longer conservative,” Kinzinger said. “It has switched its allegiance from the principles that gave it purpose to a man whose only purpose is himself. Donald Trump is a weak man pretending to be strong. He is a small man pretending to be big. He’s a faithless man pretending to be righteous. He’s a perpetrator who can’t stop playing the victim.”

Harris’ speech is her first official chance to offer her vision for the country to voters. Minnesota Gov. Tim Walz formally accepted the vice presidential nomination the day before.