Brindisi said it’s clear that Trump endangered national security by asking the president of Ukraine for a political favor in exchange for a White House visit and the release of almost $400 million in military aid authorized by Congress.

“The fact this president withheld aid from Ukraine for his own political gain is very troubling,” Brindisi told Syracuse.com | The Post-Standard. “In fact, I think it’s unconstitutional.”

Brindisi said his decision caused him “great pain” because he worked with Trump and his administration on issues ranging from trade to national security.