The vice president 's remarks echo those made by other U.S. officials in recent days , as well as many of the nation 's foremost allies . NEW : U.S. president , British prime minister talk about the situation in Syria . NEW : Syria 's info minister challenges U.S. to provide proof , or risk losing public confidence . ` ` The Syrian ##s are the only ones who have the weapons , '' Joe Biden says . U.S. and British militaries , at least , have plans for possible strike in Syria .
NEW : U.S. president , British prime minister talk about the situation in Syria . NEW : Syria 's info minister challenges U.S. to provide proof , or risk losing public confidence . ` ` The Syrian ##s are the only ones who have the weapons , '' Joe Biden says . U.S. and British militaries , at least , have plans for possible strike in Syria .