he is a former marine recruit and sharpshooter discharged for failing to disclose a history of asthma. investigators say he described himself to the informant as a muslim convert, adding, "this is what will make me more useful. i can blend in." and when the fbi searched his home they say they found firearms and a handwritten martyrdom note specifically mentioning president trump. >> pierre thomas joins us now from washington. pierre, does the fbi know how and when he allegedly became radicalized? >> tom, apparently radicalized online. the fbi claims he posted isis propaganda on social media, including calls to kill americans this holiday season. tom. >> all right, pierre, thanks so much. next tonight, president trump in mar-a-lago, hours after celebrating his first major legislative victory. the president signing that tax cut bill into law, surrounded by cameras in the oval office. president trump already looking at the next item on his agenda in the new year. here's abc's david wright.