Toomey has neither endorsed Trump nor ruled out voting for the GOP nominee, and after Friday's release of a video in which Trump bragged about kissing and groping women, Toomey once again was critical of the nominee's remarks.
But did the new revelations — a final straw for some Republican officials — diminish Toomey's view that he hopes Trump can earn his support? Toomey didn't say.
"Sadly, [Sunday] night's debate again showed the shortcomings of both presidential candidates," Toomey said in a statement released by his campaign Monday. "I have not endorsed Donald Trump and I have repeatedly spoken out against his flawed policies, and his outrageous comments, including his indefensible and appalling comments about women."
The 2005 video, which was first released Friday by The Washington Post, was previously unaired footage of Trump and "Access Hollywood" host Billy Bush as Trump waited to make a cameo appearance on a soap opera. His microphone was on, and Trump could be heard describing his attempt to seduce a married women, and bragging that "when you're a star, they let you do it. You can do anything."
On Twitter, Toomey called Trump's comments from the video "outrageous and unacceptable."
Last week, before the video emerged, Toomey said Trump is not a role model for children because of his "vulgarity and gratuitous insults of people."
Toomey has reserved his toughest criticism for Clinton, and he accused his Democratic opponent Katie McGinty of failing to say a single word against Clinton's policies. McGinty has hewed closely to Clinton's policy positions as she has campaigned with Clinton and a overlapping set of campaign surrogates across the state.
"Pennsylvania deserves a senator who will cross party lines and provide independent leadership, not a rubber stamp for a very flawed president," Toomey said in his statement.
Toomey was scheduled to appear at a Montgomery County high school Monday, but canceled the appearance.
McGinty blasted Toomey throughout the weekend for not joining Republicans who called on Trump to withdraw from the race. Her campaign dubbed him "Fraidy-Pat," and McGinty decried his statement about Trump's lewd comments as "not good enough."
She continued that critique Monday morning in a call with reporters, describing Toomey as more worried about his "political future" than about doing what is right in taking a stand against Trump.
Some Pennsylvania Republicans disavowed Trump even before the latest video surfaced, including U.S. Rep. Charlie Dent, who represents much of the Lehigh Valley, and former Gov. Tom Ridge.
Dent called on GOP party officials to replace Trump on the ballot — a task that would prove logistically challenging with early voting underway in several states.
House Speaker Paul Ryan told GOP legislators during a conference call Monday that he'll be focused on defending the party's congressional majorities and that he will not be campaigning with Trump, according to news reports.
The two Pennsylvania Senate candidates remain in a close race. An NBC News/Wall Street Journal/Marist poll released Sunday gave McGinty a 4-point advantage and one from CBS News/YouGov showed Toomey and McGinty tied.
The Pennsylvania Senate race has been the nation's most expensive and will help determine whether Republicans maintain a majority hold on the Senate for the next two years.
To win, Toomey must pick up some support from registered Democrats or independent voters. Democrats have roughly 1 million more registered voters in Pennsylvania.
The Associated Press contributed to this story.