Wrong.
1) Section 412 of the USA PATRIOT act permits indefinite detention of immigrants; see Jose Padilla, an American citizen: https://en.wikipedia.org/wiki/Jose_Padilla_(prisoner)#Habeas...
2) Sections 1021 and 1022 of NDAA FY2012 (which Obama is defending right now in Obama v. Hedges): https://en.wikipedia.org/wiki/NDAA_2012#Controversy_over_ind...
You're OK with indefinitely detaining American citizens until the government slaps some charges on & convicts? Spooky.
Read the history of the Padilla case: http://www.nyclu.org/case/padilla-v-bushhamdi-v-rumsfeld-cha....
See also: http://www.cato.org/publications/commentary/what-supreme-cou....
There was a legal wrangling over the scope of the President's detention powers, and Padilla's appeal to the Supreme Court was rendered moot by the government deciding to charge him. No U.S. citizen has been indefinitely detained since.