Sunday on 'This Week': Sen. Ron Johnson and former Defense Secretary Leon Panetta

This Sunday, as the race to the midterms kicks into high gear on Labor Day weekend, and President Trump’s approval numbers hit their low point in our new ABC News/Washington Post poll, “This Week” Co-Anchor Martha Raddatz goes one-on-one with Homeland Security Committee Chair and Foreign Relations Committee member Sen. Ron Johnson, R-Wisc. Raddatz also speaks with the female veterans looking to take the fight to Washington, including Rep. Martha McSally, R-Ariz., the GOP nominee for Arizona’s Senate seat.

Plus, complete coverage of the final tributes this weekend in Washington to the life and legacy of Sen. John McCain, including reflections from former Defense Secretary and CIA Director Leon Panetta.

Former New Jersey Governor and ABC News Contributor Chris Christie, ABC News Senior White House Correspondent Cecilia Vega, and ABC News' Cokie Roberts reflect on the services of late Sen. John McCain and analyze the latest challenges facing President Trump and the White House.

And the Powerhouse Roundtable debates the week in politics, with ABC News Political Analyst Matthew Dowd, ABC News Political Director Rick Klein, Bloomberg White House reporter Jennifer Jacobs, and Vice News Washington Bureau Chief Shawna Thomas.

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