‘This Week’ Transcript: Reince Priebus and Sen. Jeff Sessions

— -- THIS IS A RUSH TRANSCRIPT FOR 'THIS WEEK' ON May 15, 2016 and it will be updated.

UNIDENTIFIED MALE: Starting right now on THIS WEEK with George Stephanopoulos, Trump under fire. Questions on taxes.

GEORGE STEPHANOPOULOS, ABC HOST: What is your tax rate?

DONALD TRUMP (R), PRESIDENTIAL CANDIDATE: It's none of your business.

UNIDENTIFIED MALE: How he treats women. And, with his credibility on the line, his party at a crossroads...

JONATHAN KARL, ABC NEWS CORRESPONDENT: Are you endorsing Donald Trump?

REP. PAUL RYAN (R-WI), SPEAKER OF THE HOUSE: I don't want us to have a fake unification process here.

UNIDENTIFIED MALE: Is Trump ready for the road ahead?

TRUMP: It will be a little process, but it will come along.

UNIDENTIFIED MALE: Republican Party Chair Reince Priebus weighs in live.

Plus, battle lines...

MARTHA RADDATZ, ABC NEWS CORRESPONDENT: The danger is far from over.

UNIDENTIFIED MALE: Exclusive, in-depth with the American soldiers taking on ISIS -- Americans, Iraqis fighting together.

But are the politics back home driving them apart?

Martha Raddatz on the front lines, asking, are we close to defeating the enemy?

From ABC News, it's THIS WEEK.

Reporting from Baghdad, co-anchor, Martha Raddatz.

RADDATZ: Good morning to you from Iraq, where the fight against ISIS terrorists is intensifying. An enemy, a threat to our nation that voters see as one of the most important challenges our next president will surely inherit.

With a growing number of U.S. forces, nearly 5,000 U.S. troops on the ground right now in Iraq and several hundred headed to Syria, the decisions our next commander-in-chief will make about this fight will have life or death consequences.

We have seen the battle from the air, but this week, for the first time, we saw those American ground forces up close as they helped the Iraqis push back ISIS.

It is a battle that continues to claim American lives, the latest a Navy SEAL just two

. And here in Baghdad, the deadliest week in months, with half a dozen bombings and shootings, a sign that the terrorist threat is evolving yet again.

We will have exclusive interviews with American soldiers and Marines scattered across this war-torn country and a one-on-one with the U.S. commander of all ground forces here.

It is one of many important issues which voters are now examining as they ask themselves who can be trusted to be commander-in-chief?

We will look at the progress and the problems here.

But first, we turn to my colleague, Jonathan Karl, back in Washington, where this week's political battle hit a fever pitch -- Jon.

KARL: Good morning, Martha.

There is a struggle going on right now for the heart and soul of the Republican Party. But even as he was dogged by new controversies this week, this was, in many ways, a good week for Donald Trump, as the most unconventional candidate in modern political history moved one step closer to bringing the Republican establishment together with that populist electorate that helped him win the Republican primaries.

But he has a long way to go to change a general election map that is stacked against him and to win the White House in November.

(BEGIN VIDEOTAPE)

KARL (voice-over): If you were watching the news over the last few days, you might think the tide had finally turned against Donald Trump.

WOLF BLITZER, CNN ANCHOR: The tale of the tapes -- Donald Trump denying he posed as his own publicist in a telephone interview.

UNIDENTIFIED MALE: Stop asking about Donald Trump's taxes, will you?