The second kanji character in 亜米利加 (amerika, “America”) + 国 (koku, “country”). The reason the second character is used instead of the first is because 亜 is already in use as the abbreviation for 亜細亜 (ajia, “Asia”).
The Republican [sic] U.S. Congressman Weiner was going to begin an election campaign to run for the mayor of New York, but unintentionally, he sent a link to a photo of his erected penis - which was only meant to be seen by a woman who maintains unclear relationship with him on the Internet - on Twitter. Then "tragedy happened (to him)".