Pablo Martinez Monsivais/AP For a party with a history of railing against activist judges and frivolous lawsuits, Republicans sure do like to litigate. Their latest foray into the courts is likely to come over immigration, after Speaker John Boehner told his House members on Tuesday morning that the leadership was "finalizing a plan" to authorize a lawsuit against President Obama over his unilateral actions to shield millions of undocumented immigrants from deportation.