Scott Walker, governor of Wisconsin: he surged ahead last weekend in an opinion poll in Iowa, a year before parties there nominate their candidates. Photograph: Andrew Harrer/Bloomberg

When Republican governor Scott Walker proposed cutting another $300 million (€214 million) off the University of Wisconsin’s budget and told its teach(...)

Activists protest near the Manhattan apartment of billionaire and Republican financier David Koch last June in New York City. The demonstrators were protesting against the campaign contributions by the billionaire Koch brothers. Photograph: Spencer Platt/Getty Images

With just 646 days to go, the 2016 US presidential race is already starting up and the ring is packed with various Republicans vying to prove who is t(...)

EU competition commissioner Margrethe Vestager: “We consider the Luxembourg leaks as market information. We will examine it and evaluate whether or not this will lead us to opening new cases.” Photographer: Freya Ingrid Morales/Bloomberg

A new leak of confidential documents expands the list of big companies seeking secret tax deals in Luxembourg, exposing tax-saving manoeuvers by Ameri(...)

European Commission president Jean-Claude Juncker: said the interaction of national and international tax law resulted in a level of taxation in Luxembourg “which doesn’t correspond to the notion of fiscal justice”. Photograph: Jock Fistick/Bloomberg

Fresh pressure on recently elected European Commission president Jean-Claude Juncker is likely as a new set of leaked documents shows more multinat(...)

Tom Steyer: The San Francisco-based liberal has pledged $55 million (€43 million) to NextGen Climate, his super political action committee, or PAC, to fund pro-environmental candidates.  Photograph: David Paul Morris/Bloomberg

One of the biggest crusades to encourage voter turnout in this year’s US midterm elections has been led by the billionaire hedge fund founder Tom Stey(...)

Donating millions of dollars to the election campaign coffers of Republican candidates, the Koch brothers attempt to influence policy in the direction of their agenda to lower taxes and limit the role of government. Photograph: Gordon M. Grant/The New York Times

In Wichita, Kansas, locals are reluctant to speak about Charles and David Koch, the conservative billionaire industrialists whom Republicans count (...)

Jenica Krall  tries her hand at a virtual shooting booth at the 41st annual Conservative Political Action Conference  in National Harbor, Maryland. Photograph: Jim Lo Scalzo/EPA

Velvet Cowan is wearing a tight-fitting T-shirt with pictures of two guns across her chest. “Keep your hands off of my guns,” her top says. A p(...)

Three of the world’s richest men, according to Forbes magazine’s annual list of billionaires worldwide: Warren Buffett, Carlos Slim and Bill Gates.

Forbes magazine published a special edition in March with the cover headline: “Bi(...)