WASHINGTON — US Sen. John Kennedy on Sunday dared Democrats to start impeachment proceedings against President Trump, goading the House members to “go to Amazon” and “buy a spine.”

“My Democratic friends have got to make a decision on impeachment. Now, I think impeachment will be a Sisyphean task. It’ll be tough going in the Senate. Impeachment polls right up there with skim milk among the American people,” Kennedy said on CBS’ “Face the Nation.”

“But my advice to my Democratic friends is if you want to do it, go hard or go home. You know if you want to do it, go to Amazon online, buy a spine and do it.”

The Louisiana Republican then told the Democrats, “If you’re not going to do it, then let us get back to work.”

House Democrats remain indecisive on impeachment, opting for investigations and seeking remedies in the courts instead. House Judiciary Committee Chairman Jerrold Nadler (D-N.Y.) said Friday he planned to continue to hold in contempt of Congress any officials unwilling to testify.

Already, his committee voted to hold Attorney General William Barr in contempt. That now needs a full House vote.

New polling, meanwhile, shows a slight uptick in support for impeachment among Americans. A CNN survey released Sunday found that 41 percent of respondents believe President Trump should be impeached and removed from office. The survey was conducted May 28-31.

Special Counsel Robert Mueller made his only public remarks on the investigation the morning of May 29, prompting a handful of Democratic politicians to again call for the opening of an impeachment inquiry in the House. Last month the same poll found that 37 percent supported impeachment. In September 2018, support for impeachment was higher, at 47 percent.

And while Mueller said Wednesday that he didn’t want to testify before Congress, the public believes he should. Sixty-seven percent of respondents think Mueller should testify publicly, while 26 percent said he should not.