Rock guitarist, conservative activist and Mitt Romney supporter Ted Nugent says he stands by his provocative rant against the Obama administration at last weekend's National Rifle Association convention, despite mounting pressure from Democrats and an investigation by the Secret Service.

"I spoke at the NRA and I will stand by my speech. It was 100 percent positive," Nugent told the Dana Loesch radio show today.  "It's about we the people taking back our American dream from the corrupt monsters in the federal government under this administration and the communist czars he's appointed."

Nugent told a crowd of convention-goers that "if Barack Obama becomes the president in November, I will either be dead or in jail by this time next year."

"If you can't go home and get everybody in your lives to clean house in this vile, evil, America-hating administration, I don't even know what you're made of," he said at the NRA.

Democrats launched a social media and web video campaign demanding that Nugent retract his statements and Mitt Romney, whom Nugent has endorsed and stumped for, deliver a public rebuke.  Romney has not commented.

The Secret Service told ABC News it is aware of Nugent's comments and conducting "the appropriate follow-up" given the potentially threatening nature of the remarks.

"See, I'm a black Jew at a Nazi-Klan rally, and there are some power-abusing corrupt monsters in our federal government that despise me because I have the audacity to speak the truth to identify the violations of our government, particularly Eric Holder and the president and Tim Geithner, ad nauseum," Nugent told Loesch.

"I have never in my life threatened anyone's life. I'm incapable of threatening anyone's life. Because I'm about positive change, my entire speech, all my articles," he later added.

Nugent did not temper his rhetoric for Democratic National Committee chairwoman Rep. Debbie Wasserman Schultz or House Minority Leader Nancy Pelosi, whom he called "varmints."

"Varmints are sometimes clever, but they are really easy to outmaneuver," he said. "If you just listen to Wasserman Schultz, just watch the lady talk, listen to her words, examine her voting record. Listen to Nancy Pelosi, this sub-human scoundrel… these government monsters are so out of control. I'm using my First Amendment.

"The job of we the people is to spotlight cockroaches, and come November we're going to stomp them at the voting booth," he said.

Romney campaign spokeswoman Andrea Saul did not directly respond to Nugent when asked for a reaction to his comments, but she said "divisive language is offensive no matter what side of the political aisle it comes from."

"Mitt Romney believes everyone needs to be civil," Saul added.

Nugent told Loesch that he's stating publicly what Mitt Romney is really thinking but can't say.

"Mitt Romney knows what I'm saying is true. He puts it in the words for him, I put in the words for me," he said.

The Romney campaign offered no further comment when asked about Nugent's statement on the presumptive GOP presidential nominee.