aren't there libel laws?

GOP lawmakers repeatedly call liberals ‘anti-American’ on House floor.

CQ’s Jonathan Allen notes that Rep. Michele Bachmann (R-MN), Rep. Robin Hayes R-NC), and Rep. Randy Kuhl (R-NY) aren’t alone in believing that progressives are “anti-American” or “hate real Americans.” In fact, on the House floor on Sept. 17, Rep. Virginia Foxx (R-NC) said that Democrats were for “anti-American energy, just as many other things that they support seem to be anti-American power and anti-American control.” In the past year, Rep. Ted Poe (R-TX) has called Columbia University and a Los Angeles Superior Court judge “anti-American” for opposing the war in Iraq.

(Think Progress)
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So, the repugs who have destroyed this country over the last 8 years are somehow "pro-American", but liberals - for no apparent reason - are "anti-American"?! WTF?