By Andrew Chung (Reuters) -For two of the most powerful men in the United States, Donald Trump and John Roberts, it has been a delicate dance from the start. In 2015, the man who would become the chief executive of the United States assailed the integrity of its chief justice,

In a social media post, President Trump demanded the Supreme Court order lower court judges not to issue nationwide injunctions.

The chief justice is "trying to explain to the people of this country how the legal system works," retired Supreme Court Justice Stephen Breyer said.