At the heart of former finance minister, Carlos Urzua's abrupt exit from the Mexican government was a dispute with President Andres Manuel Lopez Obrador's chief of staff, a millionaire who has placed business associates in influential government posts.

As Mexico finance minister departs, tycoon's role in government raises questions

Mexico's moderate Finance Minister Carlos Urzua resigned on Tuesday with a letter that shocked markets by citing "extremism" in economic policy, before President Andres Manuel Lopez Obrador quickly named a well-regarded deputy minister to replace him.

In blow to Mexican president, finance minister quits over economic 'extremism'

The big, luxurious airplane used to ferry Mexico's former president around the globe is about to fly away permanently in one of the first moves by the new president to rid the country of what he has derided as a towering symbol of excess.

Watch: Mexico's new president to sell official planes, helicopters