Sen. Chuck GrassleyCharles (Chuck) Ernest GrassleyOvernight Health Care — Presented by Johnson & Johnson – House progressives may try to block vote on Pelosi drug bill | McConnell, Grassley at odds over Trump-backed drug pricing bill | Lawmakers close to deal on surprise medical bills GOP senators request interview with former DNC contractor to probe possible Ukraine ties Congressional leaders unite to fight for better future for America's children and families MORE (R-Iowa) says he doesn’t think gun control measures would be worthwhile until mental health issues are addressed.

Jennifer Jacobs, a Des Moines Register politics reporter, tweeted his comment from a phone call Grassley held with members of the Iowa press on Wednesday.

“Until we start addressing mental health issues,” the senator said, “I don’t think more gun laws are going to do any good.”

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The senator spoke to reporters from Washington. He went home to Iowa over the weekend.

His comment comes amid the latest call by Democrats to renew the gun control debate after 12 people were killed in Monday’s shooting at Washington’s Navy Yard.

On Tuesday, Senate Majority Leader Harry ReidHarry Mason ReidThe Hill's Morning Report — Pelosi makes it official: Trump will be impeached Doctors are dying by suicide every day and we are not talking about it Impeachment trial throws curveball into 2020 race MORE (D-Nev.) said he doesn’t have the votes to pursue gun control legislation again. Sen. Dianne FeinsteinDianne Emiel FeinsteinGiffords, Demand Justice to pressure GOP senators to reject Trump judicial pick Senate confirms Trump pick labeled 'not qualified' by American Bar Association Feinstein endorses Christy Smith for Katie Hill's former House seat MORE (D-Calif.) asked, “When will enough be enough?”

The last time the upper chamber considered such a measure was in April, when less than 60 senators voted "yes" on an amendment spearheaded by Sens. Joe ManchinJoseph (Joe) ManchinStatesmen seek bipartisan solutions to big challenges Both sides have reason to want speedy Trump impeachment trial No one wins with pro-abortion litmus test MORE (D-W.Va.) and Pat Toomey (R-Pa.). It would have expanded criminal and mental health background checks on potential gun buyers.

Grassley, the top Republican on the Senate Judiciary Committee, voted against the measure. Only four Republicans supported it.

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As an alternative, Grassley, along with Sen. Ted CruzRafael (Ted) Edward CruzDemocrats express confidence in case as impeachment speeds forward Chuck Todd challenges Cruz after senator pushes theory that Ukraine meddled in election Sunday shows — Nadler: A jury would convict Trump in 'three minutes flat' MORE (R-Texas), wrote another gun control amendment, supported by the National Rifle Association, that would increase the resources available to prosecutors for violators of gun laws and create a task force to prosecute people who fail criminal background checks.

Their bill also would have made it easier to purchase and transport firearms across state lines. But until this week, the issue has faded from Capitol Hill.

Since 2009, more than 50 mass shootings have occurred, which amounted to more than one per month, according to a study by Mayors Against Illegal Guns. New York City Mayor Michael Bloomberg founded the group.

“The problem is greater than guns,” Grassley said as the Judiciary Committee prepared to discuss gun control earlier this year in the wake of the Newtown shooting.

A clearer picture of the shooter from Monday’s tragedy is slowly emerging. According to multiple reports, law enforcement officials say the now-deceased gunman, Aaron Alexis, suffered from a host of mental health issues.

Officials are still trying to figure his motive for going on a killing spree.