washington investigation allege tie president donald trump election campaign russia threaten dampen already flag momentum president legislative agenda roll back obamacare overhaul tax code senate convene monday house representatives tuesday legislative sprint lead august recess spotlight jam comey fbi director fire trump may 9. comey appear senate intelligence committee thursday grill whether trump try get back investigation allege tie president 2016 campaign russia trump republican call russia probe witch hunt design undermine legitimacy electoral win russia matter present double-barreled threat congressional republicans could impede healthcare tax initiatives already languish could hurt efforts hold onto majorities house senate 2018 midterm elections enormous distraction create uncertainty say veteran republican representative tom cole telephone interview cast pall political system slow things want slow things three lever power cole say refer white house senate house day comey schedule testimony top u.s. intelligence officials set appear panel discuss renewal foreign intelligence surveillance act fisa allow government collect communications foreigners think live overseas whose communications pass american phone internet providers senators likely also wade russia affair nl1n1iz0vv lawmakers must also come plan raise country debt limit treasury secretary steven mnuchin clamor congress quickly approve borrow authority incoming stream tax revenues slow republican fiscal conservatives routinely demand budget cut concessions price raise debt limit set likely fight nl1n1iz13f amid trump fellow republicans congress hope new work session follow week-long memorial day break chance reset conversation washington center russia failures far healthcare tax legislation house republicans hope week pass repeal portion 2010 dodd-frank financial reform law bill face resistance senate democrats expect use procedural tactics kill even house republicans hope passage low-hanging fruit bill like allow argue rack accomplishments go home district august meanwhile senate struggle craft legislation repeal replace obamacare former president barack obama landmark law expand health insurance coverage millions place new control insurers senate majority leader mitch mcconnell may 24 interview reuters say know get 50 vote moment pledge forge ahead senators week expect present options new healthcare program hope acceptable voters one pass house nber4wkzcm failure agree formula early july could doom push kill obamacare republican vow since become law 2010. congress already months behind write budget blueprint would guide federal spend fiscal year begin oct. 1. republicans deeply divide level defense spend potential structural reform social welfare program social security medicare medicaid enough house republicans promise streamline antiquate tax code reduce rat democrats experts outside congress argue approach would largely help wealthy balloon nation debt russia probe grind trump struggle gain traction agenda