A call between President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE and his Ukrainian counterpart dominated the Sunday political talk shows amid reports that Trump asked for help in getting dirt on Democratic presidential frontrunner Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE.

Guests also weighed in on increased tensions between the U.S. and Iran.

Read The Hill's complete coverage below.

Giuliani, Fox's Roberts clash on appropriateness of Ukraine contacts By ZACK BUDRYK President Trump’s personal attorney, Rudy, Giuliani sparred with “Fox News Sunday” guest host John Roberts Sunday on the appropriateness of asking Ukrainian officials to investigate former Vice President Joe Biden. Read the full story here

Mnuchin on Trump's call with Ukraine president: 'Things are being implied that don't exist' By REBECCA KLAR Treasury Secretary Steve Mnuchin said on Sunday that allegations that President Trump elicited dirt on former Vice President Joe Biden, a 2020 White House hopeful, during a phone call with Ukraine's leader are merely speculation. Read the full story here

Pompeo doubles down on blaming Iran for oil attacks: 'This was a state-on-state act of war' By ZACK BUDRYK Secretary of State Mike Pompeo on Sunday insisted Iran was definitively to blame for attacks on Saudi oil production facilities for which Tehran-backed Houthi rebels have taken credit. Read the full story here

Mnuchin says Iran tensions 'worse' because plan 'is working' By REBECCA KLAR Treasury Secretary Steve Mnuchin said Sunday that increased tensions with Iran show that the Trump administration's approach to pressuring Tehran with sanctions is working. Read the full story here

Mattis says Iran regime is 'trying to craft a foreign policy that pushes others around' By JUSTINE COLEMAN Former Secretary of Defense Jim Mattis said on Sunday that Iran is "trying to craft a foreign policy that pushes others around" throughout the Middle East. Read the full story here

Iranian official: 'I'm not confident that we can avoid a war' By RACHEL FRAZIN Iran's Foreign Minister Mohammad Javad Zarif said that he's "not confident that we can avoid a war" but stressed that Iran will not start one amid escalating tensions with the U.S. in recent days. Read the full story here