RIO DE JANEIRO (AP) — Brazilian President Michel Temer has lost yet another of his key advisers — leaving him with just one of the original five at a moment he's struggling to hang onto power.

Former lawmaker Sandro Mabel published a letter on Wednesday saying he needs to spend more time with his family.

Three other aides had resigned or been fired earlier amid the corruption scandals that swirl around the administration — and Brazil's political class in general. Temer is resisting calls to resign over an audiotape that appears to show him approving hush money for a convicted former lawmaker.

Thousands of demonstrators are gathering in the capital of Brasilia to demand the president's ouster.