"Commitment to America" is basically in the mold of Newt's 90s "Contact with America" which is essentially a blueprint of what Republicans plan to do if elected.
Number one on their list is to cut "government spending that is raising the price of groceries, gas, cars, and housing, and growing our national debt".
This is similar to pledges they've made for longer than I've been alive, but ask yourself...
When is the last time Republicans had control of the house and used it to cut spending?
They came into power there, promising just that, in 2011... for federal government spending was at a historic high of about 3 1/2 trillion a year. When they lost control eight years later, it was about 4 1/2 trillion, or a full trillion increase. When they came into power in '95, promising cuts, federal government spending was at a historic high of about 1 1/2 trillion a year, and when they left a decade later it was about 2 1/2 trillion, or another trillion increase.
Republicans are too chicken shit to do anything about the third rail of politics, despite the unsustainability of entitlements. They've openly called, often, to spend greater amounts on the military. Entitlements (social security and medicare/caid) plus the military is essentially the entirety of federal revenue and the rest is deficit spending... The largest component of which is servicing current debt.
Maybe you live in Kentucky and you think your Republican congressman in the lower house is great. But if you think that Republicans, collectively, are going to cut federal spending overall from the house, there's no history to pin that hope on.