While the OP said that Obama should endorse surveillance of mosques, that surveillance should go a lot further.
Here's why:
"Rafia Farook, the mother of San Bernardino terrorist Syed Rizwan Farook, is an active member of the Islamic Circle of North America (ICNA),
a Muslim organization that promotes the establishment of a caliphate and has ties to a radical Pakistani political group called Jamaat-e-Islami.
Farook’s affiliation with ICNA was revealed on Friday when MSNBC and other new outlets scoured the Farooks’ apartment in Redlands, Cal. An MSNBC reporter found a certificate of appreciation presented to Safia Farook last summer by ICNA’s sisters’ wing."
Shooter’s Mother Active In US Branch Of Pro-Caliphate Islamic Group