Swalwell claimed he would not accept damaging information against his political opponents, including Trump, from a foreign adversary.
"Let me make it clear for [Donald Trump]," Swalwell said on Twitter. "I will never take dirt from a foreign adversary — EVEN if it means beating someone as corrupt as you."
Swalwell also challenged Republican lawmakers on Trump's claim that they would have acted in a similar way.
"But Trump said every Congressman would take the help. So, every @HouseGOP member should have to answer this: is Trump right?"