Former Fifa president Sepp Blatter on Monday suggested he supports fans boycotting World Cup matches in the United States this year due to security concerns.

Blatter gave his support to comments from Swiss anti-corruption lawyer Mark Pieth, who worked with Fifa on potential reforms when Blatter was president, saying fans should stay away from the US for the tournament.

“I think Mark Pieth is right to question this World Cup,” Blatter said on social media.

Pieth cited the killing of protester Renee Good by an American immigration agent in Minneapolis earlier this month as one reason for supporters not to travel to the US. Blatter’s endorsement of Pieth’s comments comes in the wake of the death of a second US citizen, Alex Pretti, last weekend.