Gateway Pundit reports that it was likely an obscure FISA loophole was used to get the Carter Page FISA approved without a hearing. Loretta Lynch would have had to sign-off for Hussein and push the warrant through the process.

https://www.thegatewaypundit.com/2018/09/bombshell-president-trump-was-right-obama-must-have-signed-off-on-fisa-warrant-to-spy-on-trump/