The White House under Gerald Ford tried to block a landmark Senate report that disclosed the CIA's role in assassination attempts against foreign leaders and ultimately led to a radical overhaul in how the agency was held to account, documents released to mark the 50th anniversary of the report's publication reveal. The documents, dating from 1975, were posted on Thursday by the National Security Archive, an independent research group, as it sought to highlight the report's significance amid conjecture that Donald Trump may have authorized the agency to assassinate Venezuela's president, Nicolás Maduro, amid a massive US military build-up against the country. Among the documents posted by the National Security Archive is a "secret/sensitive" options paper addressed to Dick Cheney, then chief of staff to Ford, that included a recommendation of outright opposition to publication of the report. Peter Kornbluh, senior analyst with the National Security Archive, said highlighting the Church report's historical significance had become more urgent. "Fifty years after the scandal of the revelations of the Church committee report, we've come a long way in the wrong direction, where we have US presidents who now seem to feel they can openly discuss assassination plots against foreign leaders," he said. At least 83 people have been killed in 21 US drone strikes against alleged drug-trafficking boats in the Caribbean and Pacific since early September.