Portugal's PM Costa resigns over corruption investigation

Portugal's Prime Minister Antonio Costa resigned on Tuesday amid an investigation into alleged irregularities committed by his majority Socialist administration in handling lithium mining and hydrogen projects in the country.

Costa announced the decision in a televised statement after meeting President Marcelo Rebelo de Sousa. He said he conscience was clear.

Prosecutors earlier on Tuesday named Infrastructure Minister Joao Galamba as a formal suspect and detained Costa's chief of staff. The opposition has demanded that the government step down with immediate effect.