As the Democratic Party's biggest players made their headline speeches on day one of the Democratic National Convention, Donald Trump stayed active on Twitter.

Here's a roundup of those tweets, with clips of the accompanying speeches.

New Jersey Sen. Cory Booker

"In this great nation, where our founders put a fundamental principle forward of religious freedom, [Donald Trump] says ban all Muslims, don't let certain people into our America because of how they pray."

Massachusetts Sen. Elizabeth Warren

"Trump's entire campaign is just one more late-night Trump infomercial. Hand over your money, your jobs, your children's future and the Great Trump Hot-Air Machine will reveal all the answers."

Vermont Sen. Bernie Sanders

"While Donald Trump is busy insulting one group after another, Hillary Clinton understands that our diversity is one of our greatest strengths."

...

"Any objective observer will conclude that based on her ideas and her leadership, Hillary Clinton must become the next president of the United States."

Sanders, however, hit right back after he returned from the podium in a response that went viral: 

Stay tuned to Fox News Channel for complete DNC coverage!