New Delhi, June 13 -- Steven Spielberg has his biggest summer in nearly two decades. Disclosure Day, his science-fiction thriller about the forced unraveling of a decades-long government cover-up of human-alien contact, opened to an estimated $44 million domestically in its debut weekend, according to Deadline's opening-weekend box office report. That figure beats the $41.8 million domestic debut of Ready Player One (2018) to stand as the best opening for an original Spielberg-Amblin production in the filmmaker's career, and his strongest overall weekend since Indiana Jones and the Kingdom of the Crystal Skull earned $100 million in May 2008.

The result comes in well ahead of the $35 million projection that Variety's pre-weekend tracking...