AS IT HAPPENED: Trump, Xi meet in Beijing; Xi’s ominous warning over ‘most important’ issue in US-China relations; Iran ‘frighteningly close’ to having nuclear weapons; Iran negotiations on the table

There is one issue that may fly under the radar, but Secretary of State Marco Rubio made sure to point it out: fentanyl.

Rubio says the production of fentanyl precursors, chemicals used to create the synthetic opioid, is one of “unique areas of cooperation” for China and the U.S.Rubio spoke with FOX News Channel on Air Force One as Trump’s entourage flew to Beijing.

Trump has made curbing fentanyl use one of the priorities of his second term.