BBC:

Billionaire David Koch, a major donor to the Republican party, has died aged 79, according to family sources.

The former majority owner of Koch Industries was ranked by Forbes below brother Charles as the 11th richest person in the world.

The native of Wichita, Kansas, ran for president as a Libertarian in 1980, calling for the abolishment of several federal government agencies.

The brothers had a huge influence on the conservative movement.

Their push for small government and a free economy made them both famous and controversial.

They fell out with President Donald Trump over his trade tariff policy.

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