A bill could become law without the president's assent if

Yes, a bill could become law without the president's assent if it is supported by a two-thirds majority of the legislature. This means that if two-thirds of the members of both the Senate and the House of Representatives vote in favor of the bill, it will become a law even if the president does not sign it. This is known as a veto override. However, this is only possible in some countries like the United States, where there is a system of checks and balances. In other countries, such as parliamentary democracies, the executive (prime minister or president) has more power to veto legislation.