Rex Tillerson, former U.S. secretary of state and Exxon Mobil Corp. chairman who has clashed with President Trump since leaving the administration, said on June 5 he supports the president’s trade objectives “but may not support the tactical moves.”

Tillerson said he was concerned that pursuing bilateral trade talks around the globe could weaken Washington’s network of friends and allies, which he called “that very strong alliance that's been knitted together over the last 100 years.”

He also said he hopes that Chinese officials “don’t decide they can’t make an agreement with this administration and wait for the next one.”

Tillerson made a rare public appearance, speaking to about 500 energy executives at KPMG’s Global Energy Conference in Houston.