The 2024 presidential election is heating up ahead of the ABC News debate, set for Sept. 10, between former President Trump and Vice President Harris. Harris arrived in Pittsburgh on Thursday where she continued to prepare for the upcoming debate. Her running mate, Minnesota Gov. Tim Walz (D), was out on the campaign trail, engaging with voters in the Keystone State. Trump completed a town hall with Fox News’ Sean Hannity and addressed the Fraternal Order of Police (FOP) national board of trustees. There, he accepted the endorsement of the nation’s largest police union. The upcoming debate between the nominees is likely going to be the focus of this week’s Sunday talk shows.  Three left-wing senators are scheduled to appear on different talk shows this week where they will likely discuss the upcoming ABC News debate.  Sen. Bernie Sanders (I-Vt.) is set to appear on NBC's “Meet the Press” where he will likely discuss what Harris can do to have a successful debate performance and reiterate his message for beating Trump in November.  Sen. John Fetterman (D-Pa.) is scheduled to be on CNN’s “State of the Union” where he will likely talk about how the vice president was received in his home state and how she will perform at the Sept. 10 debate.  Sen. Bob Casey (D-Pa.) is set to appear on CNN's “Inside Politics Sunday” where he will likely talk about his reelection campaign against GOP rival Dave McCormick. Casey will also likely discuss how the vice president will perform at the upcoming debate.  Based on recent polling, the White House contest will likely be a close. As Harris continues to campaign, Republicans continue to criticize her for switching some policy positions she held during her 2020 presidential primary run.  Some Republicans will likely talk about Harris’s campaign.  Former Republican presidential candidate Nikki Haley, who endorsed Trump after dropping out, will likely discuss both candidates’ campaigns going into the debate during her scheduled appearance on CBS “Face the Nation.”  Former Rep. Liz Cheney (R-Wyo.), who said this week she will be voting for Harris, is scheduled to appear on ABC “This Week.” Cheney will likely discuss her decision to vote for the vice president and how she will be supporting the campaign in the final 60 days.  Here is the full list of appearances on this week’s Sunday shows: NewsNation “The Hill Sunday”: Republican National Committee co-chair Lara Trump; former Rep. Mike Rogers (R-Mich.), candidate for Senate. ABC “This Week”: Former Rep. Liz Cheney (R-Wyo.); Arkansas Gov. Sarah Huckabee Sanders (R). CNN “State of the Union”: Transportation Secretary Pete Buttigieg; Sen. John Fetterman (D-Pa.); Sen. Tom Cotton (R-Ark.). CBS “Face the Nation”: North Carolina Gov. Roy Cooper (D); Former GOP presidential candidate Nikki Haley; Rep. Michael McCaul (R-Texas). FOX “Fox News Sunday”: Sen. John Cornyn (R-Texas); Sen. Chris Murphy (D-Conn.). NBC “Meet the Press”: Sen. Bernie Sanders (I-Vt.); North Dakota Gov. Doug Burgum (R). CNN “Inside Politics Sunday”: Sen. Bob Casey (D-Pa.); GOP Pennsylvania Senate rival Dave McCormick. FOX "Sunday Morning Futures": Anna Paulina Luna (R-Fl.), House Oversight Committee, House Freedom Caucus; Monica De La Cruz (R-Texas), House Financial Committee, House Agriculture Committee; Dr. Ben Carson, former HUD Secretary, founder, American Cornerstone Institute; Alina Habba, Trump Campaign Senior Adviser; Charly Arnolt, host, “Outkick The Morning.”