The riots in Washington, beyond the evident gravity of the facts, which have ruined the American prestige and may influence the judgments of foreign countries towards any US decision in foreign policy, bring to the fore an internal problem, which had remained hidden in the American political debate, because in part undervalued and in part remained in a less important position than Trump’s anomalous behavior. With what has probably been the worst presidency ever seen in Washington, the problem of the Republican party’s immediate and even longer-term future opens up. In this historical phase the dross of the Trump presidency leaves a profoundly divided formation between classic republicans, who prefer a model of the liberal right, but always and in any case within the respect of the laws of the country and populists, who want to impose a retrograde vision of the country , fruit of the pre-eminence of the Tea party ideology, which has taken over the party, and which reject democratic laws, as amply demonstrated, easily influenced by a mixture of religious and racist motivations, surrounded by incredible conspiracy theories, elaborated by skilled political manipulators , with the sole purpose of obtaining easy consent. The main objection to these theses is, that, however, Trump has achieved the record of votes for a Republican candidate and that those who stormed the American parliament and those who share this aggression, do not constitute the total of his electorate: this is true and constitutes the very basis of the dangerous division of the republican party. Currently the risk of splitting is very concrete: there is a split between the leadership of the party, which has suffered and endured Trump due to its inability to express a proper and alternative candidate, and a substantial part of the base, which has radicalized towards the populist ideologies; this radicalization did not come out of nowhere, the so-called deep America had and has characteristics that made it easy for a leader like Trump to conquer, disrespectful of democratic rules, experienced as a prevarication by political and financial elites, often perceived not without reason, as responsible for the profound inequality present in the most backward regions of the country. Also in terms of the number of deputies and senators elected to the US parliament, out of a total of 262 members, 147 have spoken out against the ratification of Biden’s election: siding with Trump they have expressed, out of conviction or opportunity, their adhesion to the wing party populist, playing a kind of gamble on their political future; in fact, if on the one hand, this support can constitute an investment, in the case of a re-nomination of Trump, even outside the Republican party, on the contrary, it probably closes every possibility within the classical republican formation. The question, however, is whether these two sides will be able to have a reconciliation; Trump and therefore his electorate does not seem willing to forgive the behavior of the party from what it considers a weakness towards the elected president, the party, however, will never be able to forgive Trump for the final act of his presidency, represented by absolute contempt towards American democratic rules. The outgoing president seems to have promised his reappointment in four years, which if it materializes, it will not be within the current perimeter, so the hypothesis of a break with American bipartisanship seems to become a possibility; however, if for Biden things appear simpler at the moment, even the Democratic party risks suffering strong tensions between the more moderate part and the left wing, which has increased its weight. Reflection is a must, especially in a time of difficulty in the American system, because it is necessary to foresee possible future scenarios, including the need for alliances outside the canonical political movements, with the consequence of a difficult governability of the most important country of the world on the international stage. The prospect must prepare the other international actors for an eventuality of internal instability in the United States, which cannot fail to be reflected in the maintenance and variation of future international balances.