Analysis

A stage full of Democratic presidential hopefuls in Miami. The two nights of debates underscored the changes within the party. Wilfredo Lee/AP hide caption

President Trump speaks at a roundtable on the economy and tax reform in April. Heading into the 2020 campaign, Democratic candidates are trying to find arguments against him on the economy, which is doing well according to top-line indicators. Adam Bettcher/Getty Images hide caption

Democratic presidential candidate Kamala Harris, D-Calif., speaks during a television interview after the second night of the first Democratic presidential debates in Miami. Cliff Hawkins/Getty Images hide caption

On Wednesday in Miami, Democratic presidential candidates take the stage during the first night of the Democratic presidential debate. From left: former Housing and Urban Development Secretary Julián Castro, New Jersey Sen. Cory Booker, Massachusetts Sen. Elizabeth Warren, former Texas Rep. Beto O'Rourke and Sen. Amy Klobuchar of Minnesota. Joe Raedle/Getty Images hide caption

Recent polling puts President Trump behind his Democratic rivals. While he dismisses them as fake news, there may be a lesson to glean from historical presidential polling. Mandel Ngan/AFP/Getty Images hide caption

President Trump and Chinese President Xi Jinping shake hands during a business leaders event in Beijing on Nov. 9, 2017. The two leaders are expected to discuss trade at this week's Group of 20 summit in Japan. Nicolas Asfouri/AFP/Getty Images hide caption

Activists in Hong Kong protest against an extradition bill on June 16. Studio Incendo hide caption

Iran's supreme leader, Ayatollah Ali Khamenei, speaks with a group of Revolutionary Guards and their families in Tehran on April 9. Tensions between Iran and the U.S. have escalated recently following Iran's shootdown of a U.S. drone and U.S. cyberattacks against an Iranian intelligence group. On Monday, President Trump announced financial sanctions against Khamenei and other top officials. Office of the Iranian Supreme Leader via AP hide caption

The justices of the U.S. Supreme Court decided a property rights case that overturned decades of precedent. Eric Baradat/AFP/Getty Images hide caption

The U.S. Supreme Court is continuing to allow Congress to delegate the details on a law's implementation, but there was a landmine in the decision. Eric Baradat/AFP/Getty Images hide caption

Protesters demonstrate outside the Chief Executive Office on Monday in Hong Kong. Anthony Kwan/Getty Images hide caption