Can democracy function free of money power influence?

I have immense insatiable curiosity about democratic governance in nations  like the United States. Just awaiting how national polity in America is shaping up with Justice Department appealing a Federal Judge  suspending the  " Travel Ban " imposed by the American Executive Branch.

Apart from self affected communities the world over,  the main forces within United States with  substantial political clouts opposing the  "travel ban"  are the Democratic Party and the high tech companies. The Democratic Party has been wounded deeply by Trump victory and so would want to oppose the President anyhow. The super duper rich high tech corporations which thrive on highly skilled but cheaper and more docile foreign human resources are naturally unhappy.  The travel ban gravely affects the pool of labour through whose services  the Tech companies reap high profits. The opposition from high tech companies is purely based on money matters " company profit ". Nothing to to with race or religion or freedom of movement although maybe disguised as such. 

If democratic way of governance  is to work then each compartment of national governance ( legislative, judiciary and executive) must uphold strictly their sovereign responsibilities without fear or greed of encroachment. Here the so  called " travel ban "  only applies to entry into United States by several categories of foreign citizens for a short period of time. It has nothing to do with American citizens' freedom of travel which the Courts must defend and preserve. 

Therefore, the Executive Order banning entry into United States by citizens of several countries for a certain period of time to allow introduction of improved vetting procedures falls under the  domain of the Executive Branch of governance. Thus I feel that the ruling by a Federal Court temporarily suspending the " travel ban " will have to be lifted by the same judge after due considerations  or overturned by an Appeal Court. If Executive Branch is prevented from exercising power in domain that is Executive in nature and essence then democratic franchise exercised by voters fails.

I think it is futile to debate on ethics of travel ban because before any definitive conclusions can be reached the travel ban will expire on its own within few months time. However, the effect on principle of power separation is far reaching. Thus my particular interest on the outcome of the appeal.