A Study of Abemaciclib and Cabozantinib in People With Clear Cell Renal Cell Carcinoma (ccRCC)

Inclusion Criteria: * Age ≥ 18 years at the time of informed consent * Patient must be able to provide informed consent, or a legal authorized representative (LAR) must be identified to provide consent in cases where the patient cannot * Signed and dated IRB-approved Informed Consent Form * Patient must have a histologically confirmed diagnosis of metastatic stage IV clear cell renal cell carcinoma or metastatic stage IV translocation-associated renal cell carcinoma. * Patient should have availability of archival tissue that enables definitive diagnosis of ccRCC or tRCC, per review at participating site, accompanied by an associated pathology report. Specimens can be collected by surgical resection or biopsy of the primary tumor or biopsy or resection of a metastatic lesion. NOTE: If archival tissue is unavailable, a patient can still enroll onto the study with documented confirmation from the study PI. * Patients must have at least one extra-skeletal, extracranial measurable lesion as defined by RECIST v1.1 * Patients must have Eastern Cooperative Oncology Group (ECOG) performance status ≤ 2 * Patients must have received prior therapy with at least 2 approved systemic agents and a maximum of 3 prior lines of systemic therapy. Prior adjuvant therapy is permitted. * Patient must have progressed on 1 prior PD-1 or PD-L1 targeted treatment and prior VEGFR directed TKI therapy * Patients must have recovered to baseline or \< Grade 1 CTCAE v5.0 from toxicities related to any prior treatments, unless adverse events (AEs) are clinically non-significant and/or stable on supportive therapy (See Appendix 2) * Patients who received radiotherapy must have completed and fully recovered from the acute effects of radiotherapy. A washout period of at least 14 days is required between end of radiotherapy and registration. * The patient can swallow oral medications. * Adequate hematologic and end organ function, defined by the following laboratory results obtained within 14 days prior to the first study treatment: * ANC ≥ 1500 cells/μL (without granulocyte colony stimulating factor support within 2 weeks prior to Cycle 1, Day 1) * WBC counts ≥ 2500/μL and ≤ 15,000/μL without G-CSF * Absolute Lymphocyte count \> 0.5K/mcL * Platelet count ≥100,000/μL (without transfusion within 2 weeks prior to Cycle 1, Day 1) * Hemoglobin ≥9.0 g/dL (without transfusion within 2 weeks prior to Cycle 1, Day 1) * Alanine aminotransferase (ALT), aspartate aminotransferase (AST), and alkaline phosphatase (ALP) ≤ 3 X upper limit of normal (ULN). ALP ≤ 5 x ULN if patient has documented bone metastases. * Serum bilirubin ≤ 1.5 x ULN. Patients with known Gilbert disease who have serum bilirubin level ≤ 2 x ULN may be enrolled. * Serum albumin ≥ 2.8 g/dl * (PT)/INR or partial thromboplastin time (PTT) test \< 1.3x the laboratory ULN * Estimated Glomerular Filtration Rate (eGFR) ≥ 30mL/min using the CKD-EPI formula https://www.kidney.org/professionals/kdoqi/gfr\_calculator. * Urine protein/creatinine ratio (UPCR) ≤ 1.8 mg/mg * Women of childbearing potential must not be pregnant or lactating at screening. * Women of childbearing potential who are sexually active with a non-sterilized male partner must use two methods of effective contraception from screening and must agree to continue using such precautions for 4 months after the final dose of investigational product; cessation of birth control after this point should be discussed with a responsible physician. Periodic abstinence, the rhythm method, and the withdrawal method are not acceptable methods of birth control. * Sexually active participants must agree to use medically accepted methods of contraception (i.e. barrier methods including condoms, female condom, or diaphragm with spermicidal gel) during the study and for 4 months after the last dose of the study treatment. Male patients must agree not to donate sperm during the study treatment period and for 4 months after the last dose Female patients must agree not to donate eggs during the study period and for 4 months after the last dose. Exclusion Criteria: * Prior treatment with abemaciclib or cabozantinib. * Receipt of any type of anti-cancer antibody, cytotoxic anticancer therapy, or any other investigational agents within 2 weeks of treatment start or 5 half-lives, whichever is shorter. For immune checkpoint inhibitors, patients must have discontinued treatment 28 days prior to trial enrollment. * Symptomatic brain metastasis or leptomeningeal disease requiring steroid use. Patients are eligible if they are neurologically stable for 4 weeks, have completed radiation therapy or surgery, and recovered from side effects. Patients must have discontinued steroid therapy for at least 2 weeks prior to first dose of study treatment. * Diagnosis of another malignancy within 2 years before first dose of study treatment, except for superficial skin cancers, or early stage cancers previously treated with curative intent. * Patients requiring moderate or strong CYP3A4 inducers or inhibitors (https://druginteractions.medicine.iu.edu/MainTable.aspx). * Patients with a history of HIV infection who are not on a stable HAART regimen and/or are requiring antimicrobials for prevention of opportunistic infections and/or have CD4 count below 250 or a detectable HIV viral load * Patients with active hepatitis B or hepatitis C infection with detectable viral load by PCR * Active systemic bacterial infection (requiring systemic antibiotics at time of initiating study treatment) or fungal infection. * History of significant cardiovascular events or active cardiovascular disease; including myocardial infarction within the previous 6 months, unstable arrhythmias, unstable angina, prior sudden cardiac arrest, LVEF \< 50% by echocardiogram (ECHO). * Uncontrolled hypertension defined as sustained blood pressure (BP) \> 150 mm Hg systolic or \> 90 mm Hg diastolic despite optimal antihypertensive treatment. * Significant arterial disease (e.g., stroke