The volley comes as Democrats coalesce around their new presidential nominee, Hillary Clinton.
The Clinton campaign has been trying for months to counter liberal suspicions that Clinton is not a true convert on TPP.
Clinton has formally won the Democratic presidential nomination, emerging from a long and bruising primary season to become the first woman to lead a major party in the race for the White House. This is a developing story. It will be updated.
"I think the ballroom and the people who own this hotel should be ashamed of themselves,” Trump said.
The $30,000 check came from an Atlantic City casino.
In his address, the Vermont senator again tossed his support behind Hillary Clinton.
The first lady got emotional at one point, talking about her two daughters.
Sanders has declined to meet with the Greens and urged his supporters to stay and change the Democrats.
There was a series of establishment types, followed by three of Trump's most outspoken defenders.
The first lady, who is one of the most popular political figures in the Democratic Party, said “in this election — I’m with her.”