According to U.S. government sources, Erdogan has warned the U.S. against removing the nuclear devices from Incirlik.
Trucks with spinning concrete mixers poured their slurry into the prepared base of the second reactor as journalists watched.
An E-6B Mercury, a nuclear command-and-control plane, hit the bird at Naval Air Station Patuxent River on Oct. 2.
Trump also said it was highly unlikely that the presence of the weapons would lead to a confrontation with Turkey.
Contradictory information out of Moscow and local authorities sparked public fears of a government cover- up.
The accident took place at an Arctic facility on Thursday, but authorities only admitted its nuclear nature on Saturday.
Washington and Moscow walked out of the Intermediate-range Nuclear Forces treaty that Reagan and Gorbachev signed in 1987.
Putin warned the United States that if it walks out of a key arms treaty, Russia will do the same.
The Democrats' takeover of the lower chamber may create aggressive oversight of nuclear programs in development.