Tillerson and the White House also clashed on policy and messaging.
Summers and Romer repeatedly clashed on policy matters, with Summers infamously blocking Romer from presenting an analysis to Obama, revealing an economic need for a stimulus package much larger than $800 billion.
Brown and Trump have clashed on numerous policies including immigration and climate change.
Although the president and Gov. Jerry Brown have clashed on numerous policies — and Trump was roundly criticized last week for erroneously blaming the fires on poor forest management and threatening to cut off funding to California — the two have pledged to work together after the devastating wildfires.
Then they narrowly skirted clashes on environmental policy at Copenhagen, and a cyber attack on Google was traced to China.
He said that it was helpful to have Mr. Navarro, with whom he has occasionally clashed on trade policy, at the table to show the Chinese that the White House is a united front.
It's true that McCain couldn't stand the president personally and often clashed with him on policy.
A Santana spokesman said the musician was talking about Pat Brown because they clashed on immigration policies.
Because the 17-nation euro zone lacks a strong central government, the bank has been forced to act as crisis manager, providing emergency funds to stricken banks, buying government bonds to try to stabilize markets, while often clashing with political leaders on policy.
It is already heavy on policy, with clashes over the economy, health care, the Iraq war, national security, and their records in Congress and the State House.
Here's a summary of what happened: Hillary Clinton and Donald Trump engaged in an occasionally raw series of clashes on topics from trade policy to the Iran deal to Trump's taxes.
