US President Joe Biden has promised the wife of basketball player Brittney Griner, who has been imprisoned in Moscow, that he will try to secure the Olympic champion’s release as soon as possible. In a telephone call, he offered Cherelle Griner his support and promised that the US government would exhaust all possibilities to bring Griner home, the White House announced on Wednesday. Biden also read Griner a draft of a letter he will send to Brittney Griner. US Vice President Kamala Harris also took part in the conversation. Russia has defended the arrest of Griner, who’s currently on trial fo…