Toomey said the amendment he crafted with Sen. Joe ManchinJoseph (Joe) ManchinOvernight Finance: House sends Dodd-Frank rollbacks to Trump | What's in the bill | Trump says there is 'no deal' to help ZTE | Panel approves bill to toughen foreign investment reviews House votes to ease regulation of banks, sending bill to Trump Senators demand answers on Trump’s ZTE deal MORE (D-W.Va.), which would have required background checks for firearm sales at gun shows and over the Internet, went down to defeat in the Senate because of the divisive political atmosphere created by the White House.

"I would suggest the administration brought this on themselves," Toomey told The Morning Call. "I understand why people have some apprehension about this administration. I don't agree with the conclusion as it applies to my [background checks] amendment, but I understand where the emotion comes from."

Toomey said his bill failed to garner 60 votes in the Senate because opponents simply didn’t trust the Obama administration to protect their Second Amendment rights.

The defeat of the background checks plan forced Democrats to shelve their broader gun control legislation, and it’s unclear whether the bill will be brought back to the Senate floor for another round of votes.

Toomey, who took heat from the National Rifle Association and other conservative groups for working with Manchin, said he’s now turning his attention to fiscal issues.