I disagree. Catholicism considers the political principle of subsidiarity as paramount.
Subsidiarity is compatible with many monarchical and republican forms of government - but it is radically incompatible with the classical absolute monarchy of the early modern period: the Reformation in Germany and England and the Gallicanist heresy in France occurred in large part because of the Papcy's dogged resistance to the claims of absolutist monarchs.
No functioning Christian can not be monarchist in at least some meaningful sense. We worship Christ the King, not Christ the President. This truth has important implications for our family lives (how democratic are your dealings with your minor children?) and our political lives (in which we recognise that just law is rooted in something greater than the popular will). Democracy as honored in the United States is a false idol.