The trip is Trump's first back home since he left in January to become president but he shouldn't expect a friendly welcome - protests are planned.
The leaders are expected to discuss North Korea, security and economic issues. They're also likely to talk about an agreement Turnbull reached with the U.S. before Trump took office for the U.S. to resettle up to 1,250 mostly Muslim refugees currently housed by Australia. The deal was a source of friction when Trump and Turnbull spoke by telephone in January.
Trump and Turnbull are also commemorating the 75th anniversary of an important World War II naval battle.