During his first four weeks in office, President Donald Trump has signed executive orders, met foreign leaders, prodded business chieftains and battled storms of controversy.
Among things he hasn't done: given congressional Republicans his plans for infrastructure improvements, health care or tax cuts.
That matters because presidential leadership is indispensable for achieving those objectives, each of which holds major significance for the American economy. Without it, even a Congress controlled by Trump's party will have immense trouble overcoming its own internal divisions.
In each case, here's why:
But some fiscal conservatives in Congress want tax overhaul to be "revenue-neutral." House Republicans, who plan to seek reductions in the top personal tax rate, are not on the same page with Senate Republicans, whose tax chairman did not include cuts in the top personal rate in his initial statement of objectives.
Nor do the two chambers have any consensus on the so-called border adjustment tax hitting imports and sparing exports. The House considers it vital; some Senate Republicans strongly oppose it, which makes the provision vulnerable in a chamber with a bare 52-seat majority.
Only one person has the clout to force resolution of differences like these. That's the president, who is currently embroiled in a crisis over interactions with Russia. The longer he remains silent, the harder it is for Congress to move.