When asked if she thought Trump's feeling were hurt because she
declined to attend, Bachmann said: "Donald Trump is a big boy. "
"These things happen. Clearly there was an attempt to have a debate and no one was taking the bait to come to this debate and so at some point it didn't even make any sense for me to come to it either," she said Sunday on CBS's "Face the Nation."
Trump said last week that he was "disappointed" with Bachmann for her decision.
"You know who I am very disappointed in? Michele Bachmann. She came up to see me four times. She would call me and ask me for advice," Trump said Friday on Fox Business Network.
Bachmann told "Face the Nation" that she declined the invitation because of the lack of participation from the Republican presidential field.
Only fellow candidates Rick Santorum and Newt Gingirch agreed to participate. The rejection of the debate by the GOP hopefuls has called the viability of the forum into question. Trump has said he's considering canceling the Dec. 27 event.
"I'm a serious candidate for president of the United States and we need to have a debate where everyone is participating," Bachmann added.
The Minnesota congresswoman has met with Trump several times throughout her campaign and hosted a virtual town hall meeting with the reality TV host.
Trump has remained a prominent presence throughout the GOP primary process, meeting with most of the presidential hopefuls.