that such a ban would be discriminatory and unconstitutional

The so-called "Muslim Ban" implemented by the Trump administration was met with legal challenges and court injunctions on the grounds that it constituted religious discrimination
. The Supreme Court allowed the ban to go into full effect while it was being litigated, but did not express any views about the merits of the ban and did not find or suggest that the ban is constitutional or compatible with immigration laws
. The ACLU and other organizations have been challenging the ban since its inception and have repeatedly found it to be unconstitutional and illegal
. Therefore, implementing a ban on Muslim immigrants until the government improves its screening process would be discriminatory and unconstitutional. Instead, the government should work to improve its screening process without discriminating against any particular group of people.