Warren said Trump's argument "didn't spring from nowhere."
"If that new president happens to be Hillary we can't just simply stonewall," Sen. Grassley said.
Sen. Charles Schumer (D-N.Y.) stopped short of calling Donald Trump a racist in an interview Tuesday, but said the Republican nominee is using bigotry to help his campaign.
"He is totally tone-deaf to what is racism,...
He noted that comprehensive immigration reform passed the Senate 68-32 in 2013.
"We do need to do something for people … living in the shadows," he said.
Sen. Rubio wants Patrick Kennedy removed from his position pending an investigation.
Rep. Marlin Stutzman came under fire for billing his campaign for a family vacation.
A spokeswoman said McCain will evaluate any potential nominee.
Sen. John McCain criticized both Clinton and Trump.
Sen. Feinstein called recent hacks a "clear effort to discredit the Clinton campaign."