​Sunday: Sen. Susan Collins and new 2016 polls

Sen. Susan Collins, R-Maine, speaks during a news conference to unveil a new gun legislation proposal, on Capitol Hill, Tuesday, June 21, 2016, in Washington. (AP Photo/Evan Vucci)
Evan Vucci, AP

It was another contentious week on the 2016 campaign trail, with new controversies from GOP nominee Donald Trump sowing further anxiety among Republicans.

One of those republicans is Maine Sen. Susan Collins, who declared in a Washington Post op-ed this week that she wouldn't vote for Trump in November. She joins us this Sunday, and we'll ask her why she called Trump "unworthy of being our president." We'll also discuss how her Republican colleagues are grappling with the chaos of the 2016 race---will they lose control of the Senate if Trump can't get his campaign back on track?

We'll have new CBS News Battleground tracker poll numbers to provide a glimpse of the state of the race in the key states of Georgia, Florida and New Hampshire. CBS News Elections Director Anthony Salvanto joins us in studio to dissect the numbers and determine what the poll means for each candidate.

And as the 2016 race intensifies, both Clinton and Trump have suggested their opponents are unfit to hold the presidency. So what kind of person is best suited to the office? We'll sit down with group of former executive branch officials to examine the attributes that make a good president, including former Director of the CIA and the National Security Agency Michael Hayden, former Senator and Secretary of Defense William Cohen, the first Secretary of Homeland Security Tom Ridge, former Pentagon official and author of "How Everything Became War and the Military Became Everything, Tales from the Pentagon" Rosa Brooks, and former Utah governor Mike Leavitt.

Our political panel will be here to break down the week's news. This week's panel discussion will include TIME Magazine's Michael Scherer, the Washington Post's Michael Gerson and Dan Balz and NPR's Audie Cornish.

It's going to be a exciting broadcast you won't want to miss! Check your local listings for airtimes. And if you miss us, catch the rebroadcast on our digital network CBSN on cbsnews.com at 11am and 6pm ET and we're now available through On Demand.