Pundits claim the Republican leadership in Congress cannot possibly satisfy the unrealistic expectations of the party’s supposedly unruly base. But while there may be disagreements at times over some issues and priorities, pro-growth conservatives will support and work with all members of Congress to promote economic growth that leads to a healthy and prosperous America.

Senate Majority Leader Mitch McConnell has already outlined two such policies—tax reform and trade—where the GOP can make a real difference. Members of the...