In February 1988, Noriega promoted Solís from education minister to president after the firing of president Eric Arturo Delvalle.[1] The US administration of president Ronald Reagan refused to recognize Solís or the diplomats representing him as legitimate.[2] In May, the administration offered a deal in which Noriega would leave office in exchange for the US dropping drug charges against him; however, the Panamanian military rejected the terms, which gave no guarantee that Solís would retain power.[3] Solís served until 1 September 1989, shortly before the US invasion of Panama which deposed Noriega.[1] He was later described as one of a series of Noriega's puppet rulers, nicknamed the "Kleenex presidents" in Panama due to their "disposability".[4] In 1994, he was pardoned by President Guillermo Endara for any crimes committed during the Noriega years.[5]
In the administration of Martín Torrijos (2004–2009), Solís served again as advisor to the education minister.[1]