President Dilma Rousseff’s opponents within her main coalition partner, the fractious Brazilian Democratic Movement Party (PMDB), are losing hope that they can impeach the leftist leader and replace her with their man, Vice President Michel Temer.

A Supreme Court ruling last month that expanded the authority of the Senate, where she has a more solid backing, and reduced the clout of lower house speaker Eduardo Cunha, her arch enemy who triggered the impeachment process, has weakened the bid by opposition parties to unseat Rousseff.

But in recent weeks, a growing consensus has emerged in Brazil’s political establishment that the evidence against Rousseff is too flimsy to justify impeachment.