Good morning, and welcome to FACE THE NATION. I’m Margaret Brennan.

We begin today with two congressional Republicans from South Carolina, Senator Tim Scott and Representative Trey Gowdy. Their new book, “Unified,” tells the story of their close friendship and their hope to heal a divided country.

Welcome to both of you, gentlemen.

REP. TREY GOWDY (R), SOUTH CAROLINA: Thank you.

SEN. TIM SCOTT (R), SOUTH CAROLINA: Thank you.

BRENNAN: I want to talk to you both about why you wrote this book, why you did it together, but I want to also ask about some of the news of the moment.

The special counsel did reveal this week that Trump campaign official Rick Gates, who is a cooperating witness in that investigation, knowingly had communications on more than one occasion during the campaign with a person the FBI believes had active ties to Russian intelligence.

Congressman, as a former prosecutor, what does this say to you?

GOWDY: It says that I’m glad we have Bob Mueller.

I’m glad we have an independent ball-and-strike caller. Congress has proven itself incapable of conducting serious investigations. And our best hope of finding out….

BRENNAN: You include your own committee, House Intelligence, on that?

GOWDY: Absolutely, not just House Intelligence.

Congressional investigations leak like the gossip girls. They — I mean, they’re terrible. And I would be telling you that if I were staying in Congress. They’re just not serious. Serious investigations don’t leak.

Serious investigations don’t make up their mind first and then go in search of the evidence to validate your previously held convictions.

BRENNAN: Did your committee do that with clearing any collusion in the case of Russia?

GOWDY: I think Adam Schiff, in March of 2017, said he had evidence, more than circumstantial, but not direct. And, oh, by the way, there is no body of evidence that’s more than circumstantial, but not direct.

But he said he had it of collusion. And we have been waiting for over a month now — for over a year now for him to actually produce that evidence. That is not serious. And I’m hoping that either the Senate investigation or Mueller will be more objective.