WASHINGTON (Reuters) - The Senate's top two Republicans on Sunday stood firm against including tax increases in any deal to raise the debt limit and shrink budget deficits one day before a meeting with President Barack Obama, but said the showdown need not go down to the "11th hour." (http://feeds.feedburner.com/~ff/reuters/topNews?d=yIl2AUoC8zA) (http://feeds.feedburner.com/~ff/reuters/topNews?i=SCdbg3qKXKg:_Myth_Vgmjo:V_sGLiPBpWU) (http://feeds.feedburner.com/~ff/reuters/topNews?i=SCdbg3qKXKg:_Myth_Vgmjo:-BTjWOF_DHI) (http://feeds.feedburner.com/~r/reuters/topNews/~4/SCdbg3qKXKg)