'I won't comment on that': Paul Ryan says Trump ad tying Democrats to murders is 'not necessarily productive'

House Speaker Paul Ryan (R-WI) said on Sunday that a Trump campaign advertisement which blames Democrats for murders committed by undocumented immigrants is "not necessarily productive" in ending the government shutdown.

While interviewing Ryan on Sunday, Face the Nation host John Dickerson pointed out that the Trump campaign began running the ad after Republicans were unable to pass a short-term funding resolution to keep the government open.

The commercial calls on Democrats to fund the president's border wall and accuses them of being "complicit in all murders" committed by undocumented immigrants.

"Are Democrats complicit?" Dickerson asked Ryan.

"Well, they're certainly not helping us keep the government open," Ryan replied glibly. "They're certainly not helping us on a solution to immigration. When you shut down the government and stop negotiating on immigration reform, they are complicit with not getting things done."

"But are they complicit in murders?" Dickerson pressed.

"I'm not going to comment," Ryan insisted after initially commenting. "I just saw that. I don't know if that's necessarily productive. It's not secret the president has strong views on immigration. But what is not productive is a pointless government shutdown that the Senate Democrats have foisted on this country."

Watch the video below from CBS.